You can create snapshots via Clish: add snapshot __SHORT__ desc "__DESCRIPTION__"
You can see all snapshots with: show snapshots
You can see details of a snapshot with: show snapshot __SHORT__
Be aware if your file system is XFS. I am not sure, but this seems to be the default since R81. We had the problem that the snapshot produces a very high load with normal disks leading to a VSX node becoming unavailable and losing connections (load rises from below 5 to far above 30 on a 32 core machine). Such, we are producing snapshots only during maintenance windows after moving all VSes to another node.