Drive Snapshot (since 1.40) can restore the system drive during the next restart.
As a requirement for this, the image must be on a local drive or USB/Firewire drive; this does not work for network drives.

You schedule this as usual for a normal restore, but when done you are asked

On the next restart your system drive is restored; by pressing a key a have a chance to suppress this.

Otherwise your system drive will be restored, and after not too much time you should be able to reboot restored system.