After freeing space, run the RegIdleBackup task again.
Editing the registry is risky. Follow these steps carefully. regback copy not working
The empty RegBack folder is the expected behavior on modern Windows versions. Do not rely on the old RegBack folder for disaster recovery. Instead, use reg save manually, enable System Restore, or use VSS-aware backup software. After freeing space, run the RegIdleBackup task again
This makes copying them for a restore useless. After freeing space