Hi, I found this thread because this interests me too as my laptop could get stolen. I really like the idea of knowing where my backed up data is located so that I could get it back fast. Only CrashPlan seems to offer this currently for the Mac -- I have not verified with SynchronizePro! yet.
Anyways, since I already have SuperDuper! it would make so much sense if this Internet backup feature would be somewhat be integrated into a tab, script or what have you - like offering a field with the domain name, router port, password, etc.
We know that backup over the web is slow, but since the backup is incremental and perhaps be active at night, so what? At least the data would be safe. What I like with SuperDuper! is, that even the system would be bootable.
So imagine your MacBook would get stolen, you'd just go/call the place where your extra drive is hooked up to and you'd be up and running in no time. Only cost would be perhaps an overnight messenger to bring you the drive.
Is this something that SuperDuper could/would do in a future version ??
P.S. I guess the question about encryption would come up -- it could make things slow. I suggest to let the user turn it on or off. If you trust the destination there would be no need for that.