As said, if you have an install of fences, it should take daily snapshot by default, and should appear in your snapshots folder to restore. Else, as a result of upgrading or re-installing windows and your old configuration's snapshot isn't there, you can recover the old snapshot if you have it still on a backup or old disk.
On old hard drive or pc, Go to C:\Users\xxxxxxx\AppData\Roaming\Stardock\Fences\Backups
(hidden directory, xxxxxx is your profile name)
Find the backup, it will be three files for each snapshot, copy and paste into same location on new pc. After restarting fences, it will appear as a snapshot, and you can then restore it.