Auto Restore for Training.

Hi
Running ProxMox 3.1 and have 10 Virtual Windows 7 running.
These are used for training purposes, students log in with RDP from remote.
Each night I manually remove each VM, then restore the backups.
Nice and fresh for the next day.
I would like to automate this if I can?
I was thinking along the lines of an automatic backup, but in reverse.
Very new to Linux,
Do I find the backup job, where are the scripts kept?
and just reverse the from to?
Can the remove be automated and is it needed?
Thanks
Tom