We noticed back in October 2018 that Microsoft’s Windows 10 operating system was not creating Registry backups anymore.
The scheduled task to create the backups was still running and the run result indicated that the operation completed successfully, but Registry backups were not created anymore.
It turns out that this is a feature, not a bug, as Microsoft has posted a support document explaining the new behaviour and the reasoning behind it.
Starting in Windows 10, version 1803, Windows no longer automatically backs up the system registry to the RegBack folder. If you browse to 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.
This might come as a surprise to some, hence it seems prudent to highlight this change. In the support article, Microsoft lists methods to reenable registry backups.