Restore a Snapshot
For Fences 2, 3, & 4:
Right-click on the desktop and select "Configure Fences..."
Click on "Layout and snapping" on the left-hand side of the configuration window that appears.
Select a snapshot you wish to revert to. A preview window will appear showing you what the desktop will look like.
4. Click ‘Restore Snapshot’ to revert the desktop to this preview.
Take a Snapshot
If you wish to take a snapshot instead, Select Take Snapshot.
Also from this location you have the option to turn on automatic daily backups of you Fences layout