Yes, you can definitely use a clone of the virtual machine/host as a restore point should you ever run into trouble. The only concern would be licensing as you'd want to limit how long you have both servers operating on the same license key to avoid the key being flagged for review. If you need to run your staging server for longer than a few days to finish your restore though you can always reach out to our support team to see what options we might have available.
Kyle Kerst
Acting IT Manager
SmarterTools Inc.
www.smartertools.com