diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b56b982d..b4f6c71ef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -232,6 +232,8 @@ set(SYSTEM_LIBS src/core/libraries/system/commondialog.cpp
                 src/core/libraries/system/msgdialog_ui.cpp
                 src/core/libraries/system/posix.cpp
                 src/core/libraries/system/posix.h
+                src/core/libraries/save_data/save_backup.cpp
+                src/core/libraries/save_data/save_backup.h
                 src/core/libraries/save_data/save_instance.cpp
                 src/core/libraries/save_data/save_instance.h
                 src/core/libraries/save_data/savedata.cpp
diff --git a/src/core/file_format/psf.cpp b/src/core/file_format/psf.cpp
index f37461ae0..48802ca8c 100644
--- a/src/core/file_format/psf.cpp
+++ b/src/core/file_format/psf.cpp
@@ -51,6 +51,8 @@ PSF& PSF::operator=(PSF&& other) noexcept {
 }
 
 bool PSF::Open(const std::filesystem::path& filepath) {
+    last_write = std::filesystem::last_write_time(filepath);
+
     Common::FS::IOFile file(filepath, Common::FS::FileAccessMode::Read);
     if (!file.IsOpen()) {
         return false;
@@ -125,6 +127,8 @@ bool PSF::Encode(const std::filesystem::path& filepath) const {
         return false;
     }
 
+    last_write = std::filesystem::file_time_type::clock::now();
+
     const auto psf_buffer = Encode();
     return file.Write(psf_buffer) == psf_buffer.size();
 }
diff --git a/src/core/file_format/psf.h b/src/core/file_format/psf.h
index 017fe87da..373b66c7e 100644
--- a/src/core/file_format/psf.h
+++ b/src/core/file_format/psf.h
@@ -70,11 +70,17 @@ public:
     void AddString(std::string key, std::string value, bool update = false);
     void AddInteger(std::string key, s32 value, bool update = false);
 
+    [[nodiscard]] std::filesystem::file_time_type GetLastWrite() const {
+        return last_write;
+    }
+
     [[nodiscard]] const std::vector<Entry>& GetEntries() const {
         return entry_list;
     }
 
 private:
+    mutable std::filesystem::file_time_type last_write;
+
     std::vector<Entry> entry_list;
 
     std::unordered_map<size_t, std::vector<u8>> map_binaries;
diff --git a/src/core/libraries/save_data/save_backup.cpp b/src/core/libraries/save_data/save_backup.cpp
new file mode 100644
index 000000000..60e4858ea
--- /dev/null
+++ b/src/core/libraries/save_data/save_backup.cpp
@@ -0,0 +1,199 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <deque>
+#include <mutex>
+#include <semaphore>
+
+#include <magic_enum.hpp>
+
+#include "save_backup.h"
+#include "save_instance.h"
+
+#include "common/logging/log.h"
+#include "common/logging/log_entry.h"
+#include "common/polyfill_thread.h"
+#include "common/thread.h"
+
+constexpr std::string_view sce_sys = "sce_sys";               // system folder inside save
+constexpr std::string_view backup_dir = "sce_backup";         // backup folder
+constexpr std::string_view backup_dir_tmp = "sce_backup_tmp"; // in-progress backup folder
+
+namespace fs = std::filesystem;
+
+namespace Libraries::SaveData::Backup {
+
+static std::jthread g_backup_thread;
+static std::counting_semaphore g_backup_thread_semaphore{0};
+
+static std::mutex g_backup_queue_mutex;
+static std::deque<BackupRequest> g_backup_queue;
+static std::deque<BackupRequest> g_result_queue;
+
+static std::atomic_int g_backup_progress = 0;
+static std::atomic g_backup_status = WorkerStatus::NotStarted;
+
+static void backup(const std::filesystem::path& dir_name) {
+    if (!fs::exists(dir_name)) {
+        return;
+    }
+    std::vector<std::filesystem::path> backup_files;
+    for (const auto& entry : fs::directory_iterator(dir_name)) {
+        const auto filename = entry.path().filename();
+        if (filename != backup_dir && filename != backup_dir_tmp) {
+            backup_files.push_back(entry.path());
+        }
+    }
+    const auto backup_dir = dir_name / ::backup_dir;
+    const auto backup_dir_tmp = dir_name / ::backup_dir_tmp;
+
+    g_backup_progress = 0;
+
+    int total_count = static_cast<int>(backup_files.size());
+    int current_count = 0;
+
+    fs::remove_all(backup_dir_tmp);
+    fs::create_directory(backup_dir_tmp);
+    for (const auto& file : backup_files) {
+        fs::copy(file, backup_dir_tmp / file.filename(), fs::copy_options::recursive);
+        current_count++;
+        g_backup_progress = current_count * 100 / total_count;
+    }
+    bool has_existing = fs::exists(backup_dir);
+    if (has_existing) {
+        fs::rename(backup_dir, dir_name / "sce_backup_old");
+    }
+    fs::rename(backup_dir_tmp, backup_dir);
+    if (has_existing) {
+        fs::remove_all(dir_name / "sce_backup_old");
+    }
+}
+
+static void BackupThreadBody() {
+    Common::SetCurrentThreadName("SaveData_BackupThread");
+    while (true) {
+        g_backup_status = WorkerStatus::Waiting;
+        g_backup_thread_semaphore.acquire();
+        BackupRequest req;
+        {
+            std::scoped_lock lk{g_backup_queue_mutex};
+            req = g_backup_queue.front();
+        }
+        if (req.save_path.empty()) {
+            break;
+        }
+        g_backup_status = WorkerStatus::Running;
+        LOG_INFO(Lib_SaveData, "Backing up the following directory: {}", req.save_path.string());
+        backup(req.save_path);
+        LOG_DEBUG(Lib_SaveData, "Backing up the following directory: {} finished",
+                  req.save_path.string());
+        {
+            std::scoped_lock lk{g_backup_queue_mutex};
+            g_backup_queue.pop_front();
+            g_result_queue.push_back(std::move(req));
+            if (g_result_queue.size() > 20) {
+                g_result_queue.pop_front();
+            }
+        }
+    }
+    g_backup_status = WorkerStatus::NotStarted;
+}
+
+void StartThread() {
+    if (g_backup_status != WorkerStatus::NotStarted) {
+        return;
+    }
+    LOG_DEBUG(Lib_SaveData, "Starting backup thread");
+    g_backup_thread = std::jthread{BackupThreadBody};
+    g_backup_status = WorkerStatus::Waiting;
+}
+
+void StopThread() {
+    if (g_backup_status == WorkerStatus::NotStarted || g_backup_status == WorkerStatus::Stopping) {
+        return;
+    }
+    LOG_DEBUG(Lib_SaveData, "Stopping backup thread");
+    {
+        std::scoped_lock lk{g_backup_queue_mutex};
+        g_backup_queue.emplace_back(BackupRequest{});
+    }
+    g_backup_thread_semaphore.release();
+    g_backup_status = WorkerStatus::Stopping;
+}
+
+bool NewRequest(OrbisUserServiceUserId user_id, std::string_view title_id,
+                std::string_view dir_name, OrbisSaveDataEventType origin) {
+    auto save_path = SaveInstance::MakeDirSavePath(user_id, title_id, dir_name);
+
+    if (g_backup_status != WorkerStatus::Waiting && g_backup_status != WorkerStatus::Running) {
+        LOG_ERROR(Lib_SaveData, "Called backup while status is {}. Backup request to {} ignored",
+                  magic_enum::enum_name(g_backup_status.load()), save_path.string());
+        return false;
+    }
+    {
+        std::scoped_lock lk{g_backup_queue_mutex};
+        g_backup_queue.push_back(BackupRequest{
+            .user_id = user_id,
+            .title_id = std::string{title_id},
+            .dir_name = std::string{dir_name},
+            .origin = origin,
+            .save_path = std::move(save_path),
+        });
+    }
+    g_backup_thread_semaphore.release();
+    return true;
+}
+
+bool Restore(const std::filesystem::path& save_path) {
+    LOG_INFO(Lib_SaveData, "Restoring backup for {}", save_path.string());
+    if (!fs::exists(save_path) || !fs::exists(save_path / backup_dir)) {
+        return false;
+    }
+    for (const auto& entry : fs::directory_iterator(save_path)) {
+        const auto filename = entry.path().filename();
+        if (filename != backup_dir) {
+            fs::remove_all(entry.path());
+        }
+    }
+
+    for (const auto& entry : fs::directory_iterator(save_path / backup_dir)) {
+        const auto filename = entry.path().filename();
+        fs::copy(entry.path(), save_path / filename, fs::copy_options::recursive);
+    }
+
+    return true;
+}
+
+WorkerStatus GetWorkerStatus() {
+    return g_backup_status;
+}
+
+bool IsBackupExecutingFor(const std::filesystem::path& save_path) {
+    std::scoped_lock lk{g_backup_queue_mutex};
+    return std::ranges::find(g_backup_queue, save_path,
+                             [](const auto& v) { return v.save_path; }) != g_backup_queue.end();
+}
+
+std::filesystem::path MakeBackupPath(const std::filesystem::path& save_path) {
+    return save_path / backup_dir;
+}
+
+std::optional<BackupRequest> PopLastEvent() {
+    std::scoped_lock lk{g_backup_queue_mutex};
+    if (g_result_queue.empty()) {
+        return std::nullopt;
+    }
+    auto req = std::move(g_result_queue.front());
+    g_result_queue.pop_front();
+    return req;
+}
+
+float GetProgress() {
+    return static_cast<float>(g_backup_progress) / 100.0f;
+}
+
+void ClearProgress() {
+    g_backup_progress = 0;
+}
+
+} // namespace Libraries::SaveData::Backup
\ No newline at end of file
diff --git a/src/core/libraries/save_data/save_backup.h b/src/core/libraries/save_data/save_backup.h
new file mode 100644
index 000000000..bcf9f5ab1
--- /dev/null
+++ b/src/core/libraries/save_data/save_backup.h
@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <filesystem>
+
+#include "common/types.h"
+
+namespace Libraries::SaveData {
+
+using OrbisUserServiceUserId = s32;
+
+namespace Backup {
+
+enum class WorkerStatus {
+    NotStarted,
+    Waiting,
+    Running,
+    Stopping,
+};
+
+enum class OrbisSaveDataEventType : u32 {
+    UMOUNT_BACKUP = 1,
+    BACKUP = 2,
+    SAVE_DATA_MEMORY_SYNC = 3,
+};
+
+struct BackupRequest {
+    OrbisUserServiceUserId user_id{};
+    std::string title_id{};
+    std::string dir_name{};
+    OrbisSaveDataEventType origin{};
+
+    std::filesystem::path save_path{};
+};
+
+// No problem calling this function if the backup thread is already running
+void StartThread();
+
+void StopThread();
+
+bool NewRequest(OrbisUserServiceUserId user_id, std::string_view title_id,
+                std::string_view dir_name, OrbisSaveDataEventType origin);
+
+bool Restore(const std::filesystem::path& save_path);
+
+WorkerStatus GetWorkerStatus();
+
+bool IsBackupExecutingFor(const std::filesystem::path& save_path);
+
+std::filesystem::path MakeBackupPath(const std::filesystem::path& save_path);
+
+std::optional<BackupRequest> PopLastEvent();
+
+float GetProgress();
+
+void ClearProgress();
+
+} // namespace Backup
+
+} // namespace Libraries::SaveData
diff --git a/src/core/libraries/save_data/save_instance.cpp b/src/core/libraries/save_data/save_instance.cpp
index 29a13cc1c..18ba2d771 100644
--- a/src/core/libraries/save_data/save_instance.cpp
+++ b/src/core/libraries/save_data/save_instance.cpp
@@ -113,7 +113,6 @@ SaveInstance& SaveInstance::operator=(SaveInstance&& other) noexcept {
     param_sfo_path = std::move(other.param_sfo_path);
     corrupt_file_path = std::move(other.corrupt_file_path);
     corrupt_file = std::move(other.corrupt_file);
-    last_write = other.last_write;
     param_sfo = std::move(other.param_sfo);
     mount_point = std::move(other.mount_point);
     max_blocks = other.max_blocks;
@@ -140,14 +139,12 @@ void SaveInstance::SetupAndMount(bool read_only, bool copy_icon, bool ignore_cor
             }
         }
         exists = true;
-        last_write = std::filesystem::file_time_type::clock::now();
     } else {
         if (!ignore_corrupt && fs::exists(corrupt_file_path)) {
             throw std::filesystem::filesystem_error(
                 "Corrupted save data", corrupt_file_path,
                 std::make_error_code(std::errc::illegal_byte_sequence));
         }
-        last_write = fs::last_write_time(param_sfo_path);
         if (!param_sfo.Open(param_sfo_path)) {
             throw std::filesystem::filesystem_error(
                 "Failed to read param.sfo", param_sfo_path,
@@ -155,7 +152,7 @@ void SaveInstance::SetupAndMount(bool read_only, bool copy_icon, bool ignore_cor
         }
     }
 
-    if (!ignore_corrupt) {
+    if (!ignore_corrupt && !read_only) {
         int err = corrupt_file.Open(corrupt_file_path, Common::FS::FileAccessMode::Write);
         if (err != 0) {
             throw std::filesystem::filesystem_error(
@@ -183,7 +180,6 @@ void SaveInstance::Umount() {
         throw std::filesystem::filesystem_error("Failed to write param.sfo", param_sfo_path,
                                                 std::make_error_code(std::errc::permission_denied));
     }
-    last_write = std::filesystem::file_time_type::clock::now();
     param_sfo = PSF();
 
     corrupt_file.Close();
diff --git a/src/core/libraries/save_data/save_instance.h b/src/core/libraries/save_data/save_instance.h
index 83d22abf3..fc6edb59e 100644
--- a/src/core/libraries/save_data/save_instance.h
+++ b/src/core/libraries/save_data/save_instance.h
@@ -5,6 +5,7 @@
 
 #include <filesystem>
 
+#include "common/io_file.h"
 #include "core/file_format/psf.h"
 
 namespace Core::FileSys {
@@ -43,7 +44,6 @@ class SaveInstance {
 
     Common::FS::IOFile corrupt_file;
 
-    std::filesystem::file_time_type last_write;
     PSF param_sfo;
     std::string mount_point;
 
@@ -90,6 +90,14 @@ public:
         return exists;
     }
 
+    [[nodiscard]] OrbisUserServiceUserId GetUserId() const noexcept {
+        return user_id;
+    }
+
+    [[nodiscard]] std::string_view GetTitleId() const noexcept {
+        return game_serial;
+    }
+
     [[nodiscard]] const std::string& GetDirName() const noexcept {
         return dir_name;
     }
@@ -98,10 +106,6 @@ public:
         return save_path;
     }
 
-    [[nodiscard]] const std::filesystem::file_time_type& GetLastWrite() const noexcept {
-        return last_write;
-    }
-
     [[nodiscard]] const PSF& GetParamSFO() const noexcept {
         return param_sfo;
     }
diff --git a/src/core/libraries/save_data/savedata.cpp b/src/core/libraries/save_data/savedata.cpp
index 74023f000..7b639ff40 100644
--- a/src/core/libraries/save_data/savedata.cpp
+++ b/src/core/libraries/save_data/savedata.cpp
@@ -18,6 +18,7 @@
 #include "core/libraries/error_codes.h"
 #include "core/libraries/libs.h"
 #include "core/libraries/save_data/savedata.h"
+#include "save_backup.h"
 #include "save_instance.h"
 
 namespace fs = std::filesystem;
@@ -56,12 +57,12 @@ constexpr u32 OrbisSaveDataBlocksMax = 32768; // 1 GiB
 constexpr size_t OrbisSaveDataMountPointDataMaxsize = 16;
 // Maximum size for a title ID (4 uppercase letters + 5 digits)
 constexpr int OrbisSaveDataTitleIdDataSize = 10;
-// Maximum size for a save data directory name
-constexpr int OrbisSaveDataDirnameDataMaxsize = 32;
 
-constexpr size_t OrbisSaveDataTitleMaxsize = 128;
-constexpr size_t OrbisSaveDataSubtitleMaxsize = 128;
-constexpr size_t OrbisSaveDataDetailMaxsize = 1024;
+constexpr int OrbisSaveDataDirnameDataMaxsize = 32;     // Maximum save directory name size
+constexpr size_t OrbisSaveDataTitleMaxsize = 128;       // Maximum title name size
+constexpr size_t OrbisSaveDataSubtitleMaxsize = 128;    // Maximum subtitle name size
+constexpr size_t OrbisSaveDataDetailMaxsize = 1024;     // Maximum detail name size
+constexpr size_t OrbisSaveDataFingerprintDataSize = 65; // Maximum fingerprint size
 
 constexpr std::string_view OrbisSaveDataDirnameSaveDataMemory = "sce_sdmemory";
 constexpr std::string_view OrbisSaveDataFilenameSaveDataMemory = "memory.dat";
@@ -120,6 +121,40 @@ struct OrbisSaveDataParam {
     int : 32;
     time_t mtime;
     std::array<u8, 32> _reserved;
+
+    void FromSFO(const PSF& sfo) {
+        memset(this, 0, sizeof(OrbisSaveDataParam));
+        title.FromString(*sfo.GetString(SaveParams::MAINTITLE));
+        subTitle.FromString(*sfo.GetString(SaveParams::SUBTITLE));
+        detail.FromString(*sfo.GetString(SaveParams::DETAIL));
+        userParam = sfo.GetInteger(SaveParams::SAVEDATA_LIST_PARAM).value_or(0);
+        const auto time_since_epoch = sfo.GetLastWrite().time_since_epoch();
+        mtime = chrono::duration_cast<chrono::seconds>(time_since_epoch).count();
+    }
+};
+
+struct OrbisSaveDataFingerprint {
+    CString<OrbisSaveDataFingerprintDataSize> data;
+    std::array<u8, 15> _pad;
+};
+
+struct OrbisSaveDataBackup {
+    OrbisUserServiceUserId userId;
+    s32 : 32;
+    const OrbisSaveDataTitleId* titleId;
+    const OrbisSaveDataDirName* dirName;
+    const OrbisSaveDataFingerprint* param;
+    std::array<u8, 32> _reserved;
+};
+
+struct OrbisSaveDataCheckBackupData {
+    OrbisUserServiceUserId userId;
+    s32 : 32;
+    const OrbisSaveDataTitleId* titleId;
+    const OrbisSaveDataDirName* dirName;
+    OrbisSaveDataParam* param;
+    OrbisSaveDataIcon* icon;
+    std::array<u8, 32> _reserved;
 };
 
 struct OrbisSaveDataDelete {
@@ -137,6 +172,19 @@ struct OrbisSaveDataIcon {
     size_t bufSize;
     size_t dataSize;
     std::array<u8, 32> _reserved;
+
+    Error LoadIcon(const std::filesystem::path& icon_path) {
+        try {
+            const Common::FS::IOFile file(icon_path, Common::FS::FileAccessMode::Read);
+            dataSize = file.GetSize();
+            file.Seek(0);
+            file.ReadRaw<u8>(buf, std::min(bufSize, dataSize));
+        } catch (const fs::filesystem_error& e) {
+            LOG_ERROR(Lib_SaveData, "Failed to load icon: {}", e.what());
+            return Error::INTERNAL;
+        }
+        return Error::OK;
+    }
 };
 
 struct OrbisSaveDataMount2 {
@@ -179,6 +227,17 @@ struct OrbisSaveDataMountResult {
     s32 : 32;
 };
 
+struct OrbisSaveDataRestoreBackupData {
+    OrbisUserServiceUserId userId;
+    s32 : 32;
+    const OrbisSaveDataTitleId* titleId;
+    const OrbisSaveDataDirName* dirName;
+    const OrbisSaveDataFingerprint* fingerprint;
+    u32 _unused;
+    std::array<u8, 32> _reserved;
+    s32 : 32;
+};
+
 struct OrbisSaveDataDirNameSearchCond {
     OrbisUserServiceUserId userId;
     int : 32;
@@ -207,6 +266,22 @@ struct OrbisSaveDataDirNameSearchResult {
     int : 32;
 };
 
+struct OrbisSaveDataEventParam { // dummy structure
+    OrbisSaveDataEventParam() = delete;
+};
+
+using OrbisSaveDataEventType = Backup::OrbisSaveDataEventType;
+
+struct OrbisSaveDataEvent {
+    OrbisSaveDataEventType type;
+    s32 errorCode;
+    OrbisUserServiceUserId userId;
+    std::array<u8, 4> _pad;
+    OrbisSaveDataTitleId titleId;
+    OrbisSaveDataDirName dirName;
+    std::array<u8, 40> _reserved;
+};
+
 bool is_rw_mode = false;
 
 static bool g_initialized = false;
@@ -252,16 +327,23 @@ static Error saveDataMount(const OrbisSaveDataMount2* mount_info,
         return Error::INVALID_LOGIN_USER;
     }
     if (mount_info->blocks < OrbisSaveDataBlocksMin2 ||
-        mount_info->blocks > OrbisSaveDataBlocksMax) {
+        mount_info->blocks > OrbisSaveDataBlocksMax || mount_info->dirName == nullptr) {
         LOG_INFO(Lib_SaveData, "called with invalid parameter");
         return Error::PARAMETER;
     }
 
+    // check backup status
+    {
+        const auto save_path = SaveInstance::MakeDirSavePath(mount_info->userId, g_game_serial,
+                                                             mount_info->dirName->data);
+        if (Backup::IsBackupExecutingFor(save_path)) {
+            return Error::BACKUP_BUSY;
+        }
+    }
+
     auto mount_mode = mount_info->mountMode;
     const bool is_ro = True(mount_mode & OrbisSaveDataMountMode::RDONLY);
-    if (!is_ro) {
-        ASSERT(True(mount_mode & OrbisSaveDataMountMode::RDWR));
-    }
+
     const bool create = True(mount_mode & OrbisSaveDataMountMode::CREATE);
     const bool create_if_not_exist = True(mount_mode & OrbisSaveDataMountMode::CREATE2);
     ASSERT(!create || !create_if_not_exist); // Can't have both
@@ -335,14 +417,69 @@ static Error saveDataMount(const OrbisSaveDataMount2* mount_info,
     return Error::OK;
 }
 
+static Error Umount(const OrbisSaveDataMountPoint* mountPoint, bool call_backup = false) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (mountPoint == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+    LOG_DEBUG(Lib_SaveData, "Umount mountPoint:{}", mountPoint->data.to_view());
+    const std::string_view mount_point_str{mountPoint->data};
+    for (auto& instance : g_mount_slots) {
+        if (instance.has_value()) {
+            const auto& slot_name = instance->GetMountPoint();
+            if (slot_name == mount_point_str) {
+                if (call_backup) {
+                    Backup::StartThread();
+                    Backup::NewRequest(instance->GetUserId(), instance->GetTitleId(),
+                                       instance->GetDirName(),
+                                       OrbisSaveDataEventType::UMOUNT_BACKUP);
+                }
+                // TODO: check if is busy
+                instance->Umount();
+                instance.reset();
+                return Error::OK;
+            }
+        }
+    }
+    return Error::NOT_FOUND;
+}
+
 int PS4_SYSV_ABI sceSaveDataAbort() {
     LOG_ERROR(Lib_SaveData, "(STUBBED) called");
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataBackup() {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataBackup(const OrbisSaveDataBackup* backup) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (backup == nullptr || backup->dirName == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+
+    const std::string_view dir_name{backup->dirName->data};
+    LOG_DEBUG(Lib_SaveData, "called dirName: {}", dir_name);
+
+    std::string_view title{backup->titleId != nullptr ? std::string_view{backup->titleId->data}
+                                                      : std::string_view{g_game_serial}};
+
+    for (const auto& instance : g_mount_slots) {
+        if (instance.has_value() && instance->GetUserId() == backup->userId &&
+            instance->GetTitleId() == title && instance->GetDirName() == dir_name) {
+            return Error::BUSY;
+        }
+    }
+
+    Backup::StartThread();
+    Backup::NewRequest(backup->userId, title, dir_name, OrbisSaveDataEventType::BACKUP);
+
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataBindPsnAccount() {
@@ -365,9 +502,54 @@ int PS4_SYSV_ABI sceSaveDataChangeInternal() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataCheckBackupData(/*const OrbisSaveDataCheckBackupData* check*/) {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataCheckBackupData(const OrbisSaveDataCheckBackupData* check) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (check == nullptr || check->dirName == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+
+    const std::string_view title{check->titleId != nullptr ? std::string_view{check->titleId->data}
+                                                           : std::string_view{g_game_serial}};
+
+    const auto save_path =
+        SaveInstance::MakeDirSavePath(check->userId, title, check->dirName->data);
+
+    for (const auto& instance : g_mount_slots) {
+        if (instance.has_value() && instance->GetSavePath() == save_path) {
+            return Error::BUSY;
+        }
+    }
+
+    if (Backup::IsBackupExecutingFor(save_path)) {
+        return Error::BACKUP_BUSY;
+    }
+
+    const auto backup_path = Backup::MakeBackupPath(save_path);
+    if (!fs::exists(backup_path)) {
+        return Error::NOT_FOUND;
+    }
+
+    if (check->param != nullptr) {
+        PSF sfo;
+        if (!sfo.Open(backup_path / "sce_sys" / "param.sfo")) {
+            LOG_ERROR(Lib_SaveData, "Failed to read SFO at {}", backup_path.string());
+            return Error::INTERNAL;
+        }
+        check->param->FromSFO(sfo);
+    }
+
+    if (check->icon != nullptr) {
+        const auto icon_path = backup_path / "sce_sys" / "icon0.png";
+        if (fs::exists(icon_path) && check->icon->LoadIcon(icon_path) != Error::OK) {
+            return Error::INTERNAL;
+        }
+    }
+
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataCheckBackupDataForCdlg() {
@@ -405,9 +587,14 @@ int PS4_SYSV_ABI sceSaveDataCheckSaveDataVersionLatest() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataClearProgress() {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataClearProgress() {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    LOG_DEBUG(Lib_SaveData, "called");
+    Backup::ClearProgress();
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataCopy5() {
@@ -546,7 +733,6 @@ Error PS4_SYSV_ABI sceSaveDataDirNameSearch(const OrbisSaveDataDirNameSearchCond
 
     std::unordered_map<std::string, PSF> map_dir_sfo;
     std::unordered_map<std::string, int> map_max_blocks;
-    std::unordered_map<std::string, time_t> map_mtime;
     std::unordered_map<std::string, OrbisSaveDataBlocks> map_free_size;
 
     for (const auto& dir_name : dir_list) {
@@ -563,10 +749,6 @@ Error PS4_SYSV_ABI sceSaveDataDirNameSearch(const OrbisSaveDataDirNameSearchCond
         size_t total = SaveInstance::GetMaxBlocks(dir_path);
         map_free_size.emplace(dir_name, total - size / OrbisSaveDataBlockSize);
         map_max_blocks.emplace(dir_name, total);
-
-        const auto last_write = fs::last_write_time(sfo_path).time_since_epoch();
-        size_t mtime = chrono::duration_cast<chrono::seconds>(last_write).count();
-        map_mtime.emplace(dir_name, mtime);
     }
 
 #define PROJ(x) [&](const auto& v) { return x; }
@@ -586,7 +768,7 @@ Error PS4_SYSV_ABI sceSaveDataDirNameSearch(const OrbisSaveDataDirNameSearchCond
         std::ranges::stable_sort(dir_list, {}, PROJ(map_free_size.at(v)));
         break;
     case OrbisSaveDataSortKey::MTIME:
-        std::ranges::stable_sort(dir_list, {}, PROJ(map_mtime.at(v)));
+        std::ranges::stable_sort(dir_list, {}, PROJ(map_dir_sfo.at(v).GetLastWrite()));
         break;
     }
 #undef PROJ
@@ -605,14 +787,8 @@ Error PS4_SYSV_ABI sceSaveDataDirNameSearch(const OrbisSaveDataDirNameSearchCond
 
         if (result->params != nullptr) {
             auto& sfo = map_dir_sfo.at(dir_list[i]);
-            auto& last_write = map_mtime.at(dir_list[i]);
             auto& param_data = result->params[i];
-            memset(&param_data, 0, sizeof(OrbisSaveDataParam));
-            param_data.title.FromString(*sfo.GetString(SaveParams::MAINTITLE));
-            param_data.subTitle.FromString(*sfo.GetString(SaveParams::SUBTITLE));
-            param_data.detail.FromString(*sfo.GetString(SaveParams::DETAIL));
-            param_data.userParam = sfo.GetInteger(SaveParams::SAVEDATA_LIST_PARAM).value_or(0);
-            param_data.mtime = last_write;
+            param_data.FromSFO(sfo);
         }
 
         if (result->infos != nullptr) {
@@ -685,10 +861,30 @@ int PS4_SYSV_ABI sceSaveDataGetEventInfo() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataGetEventResult(/*const OrbisSaveDataEventParam* eventParam,
-                                           OrbisSaveDataEvent* event*/) {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataGetEventResult(const OrbisSaveDataEventParam*,
+                                             OrbisSaveDataEvent* event) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (event == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+    LOG_DEBUG(Lib_SaveData, "called");
+
+    auto last_event = Backup::PopLastEvent();
+    if (!last_event.has_value()) {
+        return Error::NOT_FOUND;
+    }
+
+    event->type = last_event->origin;
+    event->errorCode = 0;
+    event->userId = last_event->user_id;
+    event->titleId.data.FromString(last_event->title_id);
+    event->dirName.data.FromString(last_event->dir_name);
+
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataGetFormat() {
@@ -738,13 +934,11 @@ Error PS4_SYSV_ABI sceSaveDataGetParam(const OrbisSaveDataMountPoint* mountPoint
     }
     LOG_DEBUG(Lib_SaveData, "called: paramType = {}", magic_enum::enum_name(paramType));
     const PSF* param_sfo = nullptr;
-    std::filesystem::file_time_type last_write{};
 
     const std::string_view mount_point_str{mountPoint->data};
     for (const auto& instance : g_mount_slots) {
         if (instance.has_value() && instance->GetMountPoint() == mount_point_str) {
             param_sfo = &instance->GetParamSFO();
-            last_write = instance->GetLastWrite();
             break;
         }
     }
@@ -756,13 +950,7 @@ Error PS4_SYSV_ABI sceSaveDataGetParam(const OrbisSaveDataMountPoint* mountPoint
     case OrbisSaveDataParamType::ALL: {
         const auto param = static_cast<OrbisSaveDataParam*>(paramBuf);
         ASSERT(paramBufSize == sizeof(OrbisSaveDataParam));
-        memset(param, 0, sizeof(OrbisSaveDataParam));
-        param->title.FromString(*param_sfo->GetString(SaveParams::MAINTITLE));
-        param->subTitle.FromString(*param_sfo->GetString(SaveParams::SUBTITLE));
-        param->detail.FromString(*param_sfo->GetString(SaveParams::DETAIL));
-        param->userParam = param_sfo->GetInteger(SaveParams::SAVEDATA_LIST_PARAM).value_or(0);
-        param->mtime =
-            chrono::duration_cast<chrono::seconds>(last_write.time_since_epoch()).count();
+        param->FromSFO(*param_sfo);
         if (gotSize != nullptr) {
             *gotSize = sizeof(OrbisSaveDataParam);
         }
@@ -797,7 +985,8 @@ Error PS4_SYSV_ABI sceSaveDataGetParam(const OrbisSaveDataMountPoint* mountPoint
     } break;
     case OrbisSaveDataParamType::MTIME: {
         const auto param = static_cast<time_t*>(paramBuf);
-        *param = chrono::duration_cast<chrono::seconds>(last_write.time_since_epoch()).count();
+        const auto last_write = param_sfo->GetLastWrite().time_since_epoch();
+        *param = chrono::duration_cast<chrono::seconds>(last_write).count();
         if (gotSize != nullptr) {
             *gotSize = sizeof(time_t);
         }
@@ -809,9 +998,18 @@ Error PS4_SYSV_ABI sceSaveDataGetParam(const OrbisSaveDataMountPoint* mountPoint
     return Error::OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataGetProgress() {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataGetProgress(float* progress) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (progress == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+    LOG_DEBUG(Lib_SaveData, "called");
+    *progress = Backup::GetProgress();
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataGetSaveDataCount() {
@@ -924,17 +1122,7 @@ Error PS4_SYSV_ABI sceSaveDataLoadIcon(const OrbisSaveDataMountPoint* mountPoint
         return Error::NOT_FOUND;
     }
 
-    try {
-        const Common::FS::IOFile file(path, Common::FS::FileAccessMode::Read);
-        icon->dataSize = file.GetSize();
-        file.Seek(0);
-        file.ReadRaw<u8>(icon->buf, std::min(icon->bufSize, icon->dataSize));
-    } catch (const fs::filesystem_error& e) {
-        LOG_ERROR(Lib_SaveData, "Failed to load icon: {}", e.what());
-        return Error::INTERNAL;
-    }
-
-    return Error::OK;
+    return icon->LoadIcon(path);
 }
 
 Error PS4_SYSV_ABI sceSaveDataMount(const OrbisSaveDataMount* mount,
@@ -1003,9 +1191,44 @@ int PS4_SYSV_ABI sceSaveDataRegisterEventCallback() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataRestoreBackupData() {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataRestoreBackupData(const OrbisSaveDataRestoreBackupData* restore) {
+    if (!g_initialized) {
+        LOG_INFO(Lib_SaveData, "called without initialize");
+        return Error::NOT_INITIALIZED;
+    }
+    if (restore == nullptr || restore->dirName == nullptr) {
+        LOG_INFO(Lib_SaveData, "called with invalid parameter");
+        return Error::PARAMETER;
+    }
+
+    const std::string_view dir_name{restore->dirName->data};
+    LOG_DEBUG(Lib_SaveData, "called dirName: {}", dir_name);
+
+    std::string_view title{restore->titleId != nullptr ? std::string_view{restore->titleId->data}
+                                                       : std::string_view{g_game_serial}};
+
+    const auto save_path = SaveInstance::MakeDirSavePath(restore->userId, title, dir_name);
+
+    for (const auto& instance : g_mount_slots) {
+        if (instance.has_value() && instance->GetSavePath() == save_path) {
+            return Error::BUSY;
+        }
+    }
+    if (Backup::IsBackupExecutingFor(save_path)) {
+        return Error::BACKUP_BUSY;
+    }
+
+    const auto backup_path = Backup::MakeBackupPath(save_path);
+    if (!fs::exists(backup_path)) {
+        return Error::NOT_FOUND;
+    }
+
+    const bool ok = Backup::Restore(save_path);
+    if (!ok) {
+        return Error::INTERNAL;
+    }
+
+    return Error::OK;
 }
 
 int PS4_SYSV_ABI sceSaveDataRestoreBackupDataForCdlg() {
@@ -1185,6 +1408,7 @@ Error PS4_SYSV_ABI sceSaveDataTerminate() {
         }
     }
     g_initialized = false;
+    Backup::StopThread();
     return Error::OK;
 }
 
@@ -1194,28 +1418,8 @@ int PS4_SYSV_ABI sceSaveDataTransferringMount() {
 }
 
 Error PS4_SYSV_ABI sceSaveDataUmount(const OrbisSaveDataMountPoint* mountPoint) {
-    if (!g_initialized) {
-        LOG_INFO(Lib_SaveData, "called without initialize");
-        return Error::NOT_INITIALIZED;
-    }
-    if (mountPoint == nullptr) {
-        LOG_INFO(Lib_SaveData, "called with invalid parameter");
-        return Error::PARAMETER;
-    }
-    LOG_DEBUG(Lib_SaveData, "called mountPoint:{}", mountPoint->data.to_view());
-    const std::string_view mount_point_str{mountPoint->data};
-    for (auto& instance : g_mount_slots) {
-        if (instance.has_value()) {
-            const auto& slot_name = instance->GetMountPoint();
-            if (slot_name == mount_point_str) {
-                // TODO: check if is busy
-                instance->Umount();
-                instance.reset();
-                return Error::OK;
-            }
-        }
-    }
-    return Error::NOT_FOUND;
+    LOG_DEBUG(Lib_SaveData, "called");
+    return Umount(mountPoint);
 }
 
 int PS4_SYSV_ABI sceSaveDataUmountSys() {
@@ -1223,9 +1427,9 @@ int PS4_SYSV_ABI sceSaveDataUmountSys() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceSaveDataUmountWithBackup(const OrbisSaveDataMountPoint* mountPoint) {
-    LOG_ERROR(Lib_SaveData, "(STUBBED) called");
-    return ORBIS_OK;
+Error PS4_SYSV_ABI sceSaveDataUmountWithBackup(const OrbisSaveDataMountPoint* mountPoint) {
+    LOG_DEBUG(Lib_SaveData, "called");
+    return Umount(mountPoint, true);
 }
 
 int PS4_SYSV_ABI sceSaveDataUnregisterEventCallback() {
diff --git a/src/core/libraries/save_data/savedata.h b/src/core/libraries/save_data/savedata.h
index a21b9692b..83fc4ac2d 100644
--- a/src/core/libraries/save_data/savedata.h
+++ b/src/core/libraries/save_data/savedata.h
@@ -10,25 +10,23 @@ class SymbolsResolver;
 }
 
 namespace Libraries::SaveData {
-
-constexpr int ORBIS_SAVE_DATA_FINGERPRINT_DATA_SIZE = 65;
-struct OrbisSaveDataFingerprint {
-    char data[ORBIS_SAVE_DATA_FINGERPRINT_DATA_SIZE];
-    char padding[15];
-};
-
 enum class Error : u32;
 enum class OrbisSaveDataParamType : u32;
 
+struct OrbisSaveDataBackup;
+struct OrbisSaveDataCheckBackupData;
 struct OrbisSaveDataDelete;
+struct OrbisSaveDataDirNameSearchCond;
+struct OrbisSaveDataDirNameSearchResult;
+struct OrbisSaveDataEvent;
+struct OrbisSaveDataEventParam;
 struct OrbisSaveDataIcon;
 struct OrbisSaveDataMount2;
 struct OrbisSaveDataMount;
 struct OrbisSaveDataMountInfo;
 struct OrbisSaveDataMountPoint;
 struct OrbisSaveDataMountResult;
-struct OrbisSaveDataDirNameSearchCond;
-struct OrbisSaveDataDirNameSearchResult;
+struct OrbisSaveDataRestoreBackupData;
 
 /*typedef u32 OrbisSaveDataSaveDataMemoryOption;
 #define ORBIS_SAVE_DATA_MEMORY_OPTION_NONE (0x00000000)
@@ -51,22 +49,6 @@ struct OrbisSaveDataMemorySetupResult {
     u8 reserved[16];
 };
 
-typedef u32 OrbisSaveDataEventType;
-#define SCE_SAVE_DATA_EVENT_TYPE_INVALID (0)
-#define SCE_SAVE_DATA_EVENT_TYPE_UMOUNT_BACKUP_END (1)
-#define SCE_SAVE_DATA_EVENT_TYPE_BACKUP_END (2)
-#define SCE_SAVE_DATA_EVENT_TYPE_SAVE_DATA_MEMORY_SYNC_END (3)
-
-struct OrbisSaveDataEvent {
-    OrbisSaveDataEventType type;
-    s32 errorCode;
-    s32 userId;
-    u8 padding[4];
-    OrbisSaveDataTitleId titleId;
-    OrbisSaveDataDirName dirName;
-    u8 reserved[40];
-};
-
 struct OrbisSaveDataMemoryData {
     void* buf;
     size_t bufSize;
@@ -95,18 +77,6 @@ struct OrbisSaveDataMemorySet2 {
     u8 reserved[24];
 };
 
-struct OrbisSaveDataCheckBackupData {
-    s32 userId;
-    int : 32;
-    const OrbisSaveDataTitleId* titleId;
-    const OrbisSaveDataDirName* dirName;
-    OrbisSaveDataParam* param;
-    OrbisSaveDataIcon* icon;
-    u8 reserved[32];
-};
-
-typedef struct _OrbisSaveDataEventParam OrbisSaveDataEventParam;
-
 typedef u32 OrbisSaveDataMemorySyncOption;
 
 #define SCE_SAVE_DATA_MEMORY_SYNC_OPTION_NONE (0x00000000)
@@ -127,12 +97,12 @@ constexpr int ORBIS_SAVE_DATA_PARAM_TYPE_USER_PARAM = 4;
 constexpr int ORBIS_SAVE_DATA_PARAM_TYPE_MTIME = 5;*/
 
 int PS4_SYSV_ABI sceSaveDataAbort();
-int PS4_SYSV_ABI sceSaveDataBackup();
+Error PS4_SYSV_ABI sceSaveDataBackup(const OrbisSaveDataBackup* backup);
 int PS4_SYSV_ABI sceSaveDataBindPsnAccount();
 int PS4_SYSV_ABI sceSaveDataBindPsnAccountForSystemBackup();
 int PS4_SYSV_ABI sceSaveDataChangeDatabase();
 int PS4_SYSV_ABI sceSaveDataChangeInternal();
-int PS4_SYSV_ABI sceSaveDataCheckBackupData(/*const OrbisSaveDataCheckBackupData* check*/);
+Error PS4_SYSV_ABI sceSaveDataCheckBackupData(const OrbisSaveDataCheckBackupData* check);
 int PS4_SYSV_ABI sceSaveDataCheckBackupDataForCdlg();
 int PS4_SYSV_ABI sceSaveDataCheckBackupDataInternal();
 int PS4_SYSV_ABI sceSaveDataCheckCloudData();
@@ -140,7 +110,7 @@ int PS4_SYSV_ABI sceSaveDataCheckIpmiIfSize();
 int PS4_SYSV_ABI sceSaveDataCheckSaveDataBroken();
 int PS4_SYSV_ABI sceSaveDataCheckSaveDataVersion();
 int PS4_SYSV_ABI sceSaveDataCheckSaveDataVersionLatest();
-int PS4_SYSV_ABI sceSaveDataClearProgress();
+Error PS4_SYSV_ABI sceSaveDataClearProgress();
 int PS4_SYSV_ABI sceSaveDataCopy5();
 int PS4_SYSV_ABI sceSaveDataCreateUploadData();
 int PS4_SYSV_ABI sceSaveDataDebug();
@@ -169,8 +139,8 @@ int PS4_SYSV_ABI sceSaveDataGetClientThreadPriority();
 int PS4_SYSV_ABI sceSaveDataGetCloudQuotaInfo();
 int PS4_SYSV_ABI sceSaveDataGetDataBaseFilePath();
 int PS4_SYSV_ABI sceSaveDataGetEventInfo();
-int PS4_SYSV_ABI sceSaveDataGetEventResult(/*const OrbisSaveDataEventParam* eventParam,
-                                           OrbisSaveDataEvent* event*/);
+Error PS4_SYSV_ABI sceSaveDataGetEventResult(const OrbisSaveDataEventParam* eventParam,
+                                             OrbisSaveDataEvent* event);
 int PS4_SYSV_ABI sceSaveDataGetFormat();
 int PS4_SYSV_ABI sceSaveDataGetMountedSaveDataCount();
 Error PS4_SYSV_ABI sceSaveDataGetMountInfo(const OrbisSaveDataMountPoint* mountPoint,
@@ -178,7 +148,7 @@ Error PS4_SYSV_ABI sceSaveDataGetMountInfo(const OrbisSaveDataMountPoint* mountP
 Error PS4_SYSV_ABI sceSaveDataGetParam(const OrbisSaveDataMountPoint* mountPoint,
                                        OrbisSaveDataParamType paramType, void* paramBuf,
                                        size_t paramBufSize, size_t* gotSize);
-int PS4_SYSV_ABI sceSaveDataGetProgress();
+Error PS4_SYSV_ABI sceSaveDataGetProgress(float* progress);
 int PS4_SYSV_ABI sceSaveDataGetSaveDataCount();
 int PS4_SYSV_ABI sceSaveDataGetSaveDataMemory(const u32 userId, void* buf, const size_t bufSize,
                                               const int64_t offset);
@@ -206,7 +176,7 @@ int PS4_SYSV_ABI sceSaveDataMountSys();
 int PS4_SYSV_ABI sceSaveDataPromote5();
 int PS4_SYSV_ABI sceSaveDataRebuildDatabase();
 int PS4_SYSV_ABI sceSaveDataRegisterEventCallback();
-int PS4_SYSV_ABI sceSaveDataRestoreBackupData();
+Error PS4_SYSV_ABI sceSaveDataRestoreBackupData(const OrbisSaveDataRestoreBackupData* restore);
 int PS4_SYSV_ABI sceSaveDataRestoreBackupDataForCdlg();
 int PS4_SYSV_ABI sceSaveDataRestoreLoadSaveDataMemory();
 Error PS4_SYSV_ABI sceSaveDataSaveIcon(const OrbisSaveDataMountPoint* mountPoint,
@@ -232,7 +202,7 @@ Error PS4_SYSV_ABI sceSaveDataTerminate();
 int PS4_SYSV_ABI sceSaveDataTransferringMount();
 Error PS4_SYSV_ABI sceSaveDataUmount(const OrbisSaveDataMountPoint* mountPoint);
 int PS4_SYSV_ABI sceSaveDataUmountSys();
-int PS4_SYSV_ABI sceSaveDataUmountWithBackup(const OrbisSaveDataMountPoint* mountPoint);
+Error PS4_SYSV_ABI sceSaveDataUmountWithBackup(const OrbisSaveDataMountPoint* mountPoint);
 int PS4_SYSV_ABI sceSaveDataUnregisterEventCallback();
 int PS4_SYSV_ABI sceSaveDataUpload();
 int PS4_SYSV_ABI Func_02E4C4D201716422();