qm-snapshot
Create virtual machine snapshots.
TLDR
Create a snapshot of a specific virtual machine
$ qm snapshot [vm_id] [snapshot_name]
Create a snapshot with a specific description
$ qm snapshot [vm_id] [snapshot_name] --description [description]
Create a snapshot including the vmstate
$ qm snapshot [vm_id] [snapshot_name] --description [description] --vmstate 1