Snapshot - Removing an Oracle Virtual Box Snapshot
Snapshots can take a great deal of disk space.
You may consider removing snapshots to regain disk space.
Use caution when removing snapshots. Be certain you will never need to return to the machine state stored by the snapshot.
Removing a Snapshot
Open Virtual Box Machine Manager.
Left-click on the machine that contains the snapshot you wish to remove.
Left-click on the menu bar and select Snapshots.
Left-click on the snapshot you wish to delete and then select the delete icon.