Using different parameters from the
qemu-img snapshot command you can list, apply, create, or delete an existing snapshot (snapshot) of specified image (filename).
qemu-img snapshot [ -l | -a snapshot | -c snapshot | -d snapshot ] filename
The accepted arguments are as follows:
-l lists all snapshots associated with the specified disk image.
The apply option,
-a, reverts the disk image (filename) to the state of a previously saved snapshot.
-c creates a snapshot (snapshot) of an image (filename).
-d deletes the specified snapshot.