Quote:Some supported versions of Windows 10 appear to have a bug currently that prevents the successful execution of the Registry backup task that is enabled by default on PCs running the operating system.

Windows 10 includes a task that creates backups of the Windows Registry regularly when the system is idle. These backups are placed in the C:\Windows\System32\config\RegBack and can be used to restore the Registry.

Current versions of Windows 10, including at the very least Windows 10 version 1803 and 1809, and the latest Insider builds of version 1903, report in the Task Scheduler that the Registry backup task completed successfully when it has not in fact.

Full reading: https://www.ghacks.net/2018/10/31/windows-10-bug-prevents-registry-backup-creation/