Why can't I restore an older version from central storage?
In Window Vista and Windows 7, the interaction with NAS filers can cause problems when trying to restore snapshots via the Explorer graphical user interface (GUI).
Although the manufacturer of the NAS filer is aware of the bug, there is currently no fix. The snapshots are nevertheless available because they are generated by the NAS filer systems on a regular basis. You can use Webdisk to access older versions of your folders for instance.