Rolling Back a Snapshot
You can use the “rollback” icon to discard all changes made to a volume since a specific snapshot was created.
The volume reverts to its state at the time the snapshot was taken. By default, the command cannot roll back to a snapshot other than the most recent snapshot.
To roll back to an earlier snapshot, all intermediate snapshots will be destroyed.
The rollback forbidden if clones of any intermediate snapshots exists. Also in this case all these nested object must be deleted before.