I actually have an amendment to offer up for Non Stop Mac's Backpack backup process. While I haven't tested this out yet, it should work in theory: instead of saving this system out as an Automator action, I bet you could save it as a folder action, then simply attach it to a folder of stuff you want to back up. In a sense, this might be a basic, one-way iDisk: you could (theoretically) save items to this folder, which would then automatically be emailed to Backpack. If you try any of this out, feel free to share your thoughts on the experience.
[via Backpack blog]