It was noted back in October 2018 that there was a change to how Microsoft created registry backups. "Microsoft’s push to Windows 10 may have become a bit more complicated. Microsoft has issued a warning to millions of Windows 10 users that Registry backups have been shut off for months. It was initially reported as a bug, but now Microsoft has confirmed they intentionally shut Registry backups off eight months ago. Registry backups would still display as completed, although no backup file would actually exist.
According to Microsoft:
* Starting in Windows 10, version 1803, Windows no longer automatically backs up the system registry to the RegBack folder. If you browse to the \Windows\System32\config\RegBack folder in Windows Explorer, you will still see each registry hive, but each file is 0kb in size.
* This change is by design and is intended to help reduce the overall disk footprint size of Windows. To recover a system with a corrupt registry hive, Microsoft recommends that you use a system restore point."
Martin Brinkmann, reported that "the Registry backup option has been disabled but not removed according to Microsoft. Administrators who would like to restore the functionality may do so by changing the value of a Registry key:
Open the Start menu, type regedit.exe, and select the Registry Editor entry from the list of results.
Navigate to the following key: HKLM\System\CurrentControlSet\Control\Session Manager\Configuration Manager\
Right-click on Configuration Manager and select New > Dword (32-bit) Value.
Name it EnablePeriodicBackup.
Double-click on it after creation and set its value to 1.
Restart the PC.
Windows 10 will backup the Registry again from that point on."