SuperDuper! on Time Capsule
 

I have a Time Capsule which running Time Machine backups and which is also my connection to the internet. I would like to also have SuperDuper! manage a smart backup on the Time Capsule. My recollection, unfortunately somewhat vague, is that this can be accomplished by placing a sparse bundle alongside the Time Machine folder on the Time Capsule and using that sparse bundle as the recipient of the smart backups. Is this so or am I wrong? If I am on the right track is there a good description somewhere as to just how to set such up?

Yes: see "Backing up over a network" in the User's Guide, and the "Airport Disks" post at the Shirt Pocket blog.