diff --git a/Utilities/Log.cpp b/Utilities/Log.cpp
index 8a74977963..7843048e7c 100644
--- a/Utilities/Log.cpp
+++ b/Utilities/Log.cpp
@@ -300,13 +300,17 @@ logs::file_writer::file_writer(const std::string& name)
 
 #ifdef _WIN32
 		m_fmap = CreateFileMappingW(m_file.get_handle(), 0, PAGE_READWRITE, s_log_size >> 32, s_log_size & 0xffffffff, 0);
-		m_fptr = (uchar*)MapViewOfFile(m_fmap, FILE_MAP_WRITE, 0, 0, 0);
+		m_fptr = m_fmap ? (uchar*)MapViewOfFile(m_fmap, FILE_MAP_WRITE, 0, 0, 0) : nullptr;
 #else
 		m_file.trunc(s_log_size);
 		m_fptr = (uchar*)::mmap(0, s_log_size, PROT_READ | PROT_WRITE, MAP_SHARED, m_file.get_handle(), 0);
 #endif
 
+		verify(m_name.c_str()), m_fptr;
 		std::memset(m_fptr, '\n', s_log_size);
+
+		// Rotate backups (TODO)
+		fs::rename(m_name + ".gz", m_name + "1.gz", true);
 	}
 	catch (...)
 	{