Sadly, I think I got lost here. So you're logging into their machines and initiating backups of their systems to your computer?

This is one of the features I like so much about Crashplan. As long as two people have the software installed, with a code you can back up to the other person's computer. And this way you don't have to do it manually or remember to do it at all.

Other than that I'm glad Mac has something like this built in. I'm still waiting for GoToAssist to add unattended support...support for 10.7.