Backup Registry - this backs up all of the registry files and puts the backup in the Windows\System32\RegVac directory.  It is a good idea to make a backup periodically.  Backups can be large, so it is also a good idea to delete old backups.

You can use the Clean up Backups button to delete old backups.  After clicking on that button, a Browse window will open with the Backup folders in it.  Select a folder and click on OK.  The selected folder will be deleted.  If you click on Cancel, the selected folder will NOT be deleted.

 

Pack Registry - this defrags the registry.  Adding and removing entries from the registry can cause the registry to become fragmented.  This is because new entries are always added to the end of the file and old entries are simply blanked out.  If the registry becomes too fragmented, Windows will misbehave.  Packing the registry puts all of the entries in the registry in their proper place in the file usually making the file smaller and more efficient.  A Pack doesn't need to be done more than once a month.  Doing a Pack too often is of no benefit.  The Pack cannot complete until Windows restarts, so please be prepared to restart Windows after the Pack Registry process.

 

Restore Registry - this allows you to put the registry back to the way it was in one of the Backups.  Only RegVac Backups may be restored, so if you have not made a Backup with RegVac, this cannot be used.  This is to be used when you have problems and Undo does not solve them.