Create VirtualBox SnapShots from command line.
Use VBoxManage snapshot.

New SnapShot

VBoxManage snapshot MyVM take MySnapShot
VboxManage snapshot 99999999-9999-9999-9999-999999999999 take MySnpaShot

Get SnapShots

VBoxManage snapshot list MyVM 
VboxManage snapshot list 99999999-9999-9999-9999-999999999999

Restore SnapShots

VBoxManage snapshot MyVM restore MySnapShot
VboxManage snapshot 99999999-9999-9999-9999-999999999999 restore MySnpaShot

Delete SnapShots

VBoxManage snapshot MyVM delete MySnapShot
VboxManage snapshot 99999999-9999-9999-9999-999999999999 delete MySnpaShot

Related

• Manage VirtualBox Virtual Machines from command line
• Create VirtualBox VM from command line
• Create New VirtualBox VM from Command Line.
• Make Virtual Box VM Autostart