Index: sources/device/DeviceController.cpp
===================================================================
diff -u -rcad1ea2c3c42c93461f4197921f8a5938fe872c8 -r170fd9a04fab2e2ba96bdc16ca39f86789895937
--- sources/device/DeviceController.cpp	(.../DeviceController.cpp)	(revision cad1ea2c3c42c93461f4197921f8a5938fe872c8)
+++ sources/device/DeviceController.cpp	(.../DeviceController.cpp)	(revision 170fd9a04fab2e2ba96bdc16ca39f86789895937)
@@ -996,7 +996,7 @@
     if ( isBootPOST && isCurrent ) {
         // no log backup if it is the BootPOST log file, only rename and add the serial to it.
         fileDest = QString("%1/%2.%3").arg(filePath, fileBase.prepend(_Logger.logFileNameHDSN() + _Logger.fileSeparator()), fileInfo.completeSuffix());
-        ok = QFile::rename(fileSrc, fileDest);
+        ok = FileHandler::append(fileSrc, fileDest, true);
         return false;
     }
 
Index: sources/storage/FileHandler.cpp
===================================================================
diff -u -rca40cfec5ff6b63d4685ceb2e62ebe9366adcfd0 -r170fd9a04fab2e2ba96bdc16ca39f86789895937
--- sources/storage/FileHandler.cpp	(.../FileHandler.cpp)	(revision ca40cfec5ff6b63d4685ceb2e62ebe9366adcfd0)
+++ sources/storage/FileHandler.cpp	(.../FileHandler.cpp)	(revision 170fd9a04fab2e2ba96bdc16ca39f86789895937)
@@ -58,6 +58,22 @@
     ++count;
 }
 
+bool FileHandler::append(const QString &vSource, const QString &vTarget, bool vRemoveSource) {
+    bool ok = false;
+    QString content;
+    ok = read(vSource, content);
+    if ( ! ok ) goto lOut;
+
+    ok = write(vTarget, content, true);
+    if ( ! ok ) goto lOut;
+
+    if ( ! vRemoveSource ) goto lOut;
+    ok = QFile::remove(vSource);
+    if ( ! ok ) goto lOut;
+
+lOut:
+    return ok;
+}
 /*!
  * \brief   FileHandler::write
  * \details writes content vContent into the file vFileName.
Index: sources/storage/FileHandler.h
===================================================================
diff -u -rca40cfec5ff6b63d4685ceb2e62ebe9366adcfd0 -r170fd9a04fab2e2ba96bdc16ca39f86789895937
--- sources/storage/FileHandler.h	(.../FileHandler.h)	(revision ca40cfec5ff6b63d4685ceb2e62ebe9366adcfd0)
+++ sources/storage/FileHandler.h	(.../FileHandler.h)	(revision 170fd9a04fab2e2ba96bdc16ca39f86789895937)
@@ -69,6 +69,7 @@
     static int  removeFiles (const QStringList &vFolders, const QStringList &vNameFilter, const QDate &vDateOlderThan);
     static bool makeFolder  (const QString     &vFolder);
     static bool isMounted   (const QString     &vPath, bool *vIsReadOnly = nullptr);
+    static bool append      (const QString     &vSource , const QString     &vTarget    , bool vRemoveSource);
 
     static bool tmpUsable   ();