from SuperDuper!'s User's Guide, which is available in the dmg on their
site:
Restoring from a bootable backup
First, if youve backed up to an internal partition, you can start up from it (hold down the Option key when you start your Macintosh and select the backup partition), and then use SuperDuper! to restore the data to the original location. (This works just like backing up, above.)
Similarly, if youve stored a bootable backup on an external FireWire drive, and your Macintosh is capable of starting up from FireWire, hold down the Option key when you start, select the FireWire drive, and use SuperDuper!
to perform the restore.
Restoring when you cant start up from your backup
If you have a backup image or volume, but cant start up from it, you can still restore using your OS X install disc. To do so:
Start up from the OS X Install disc.
When the Installer starts, choose Disk Utility from its Application menu.
Once the Disk Utility starts, select the drive you want to restore to, and switch to the Restore tab.
Note
If youre restoring from a sparse image, as in the following screen shot [see attached picture], first open the image by choosing File > Open Image... in Disk Utility. Then, use the volume that appears (e.g.Backup, below) as the source.
Follow the instructions on the Restore tab: the backup created by SuperDuper is fully compatible with Disk Utilitys Restore function.
Once the backup has been restored, restart your computer with Option held down, and select it as your startup volume.
Recovery accomplished!