I just got a new MacBook Pro since I was due for a new machine and needed Lion for the new Xcode. I also got an Apple TV with the idea of centralizing all the digital media in my house by hosting it on my old Snow-Leopard MacBook Pro using iTunes.
I set up the new machine using my USB drive's Time-Machine partition and fixed up a few odds and ends and am now happily using Lion there. But I want to use the USB drive on the old machine as a Time-Machine drive for both machines.
But the new Lion machine doesn't see the shared drive from the old machine and I don't want to swap the drive around, I just want it to work as a backup when I connect to my home network. I've spent the afternoon reading articles on how to do this for various flavors of OSX but none of them address my configuration and now I feel over-saturated with information.
So, my questions are: First, can I do this? Second, where can I find good documentation on setting this up? I'm fairly technical and am not afraid of getting deep into the details if it will give me a painless way to do backups and I've grown to like the simplicity of Time-Machine. (Plus I use VCS systems for all the critical files in my day to day work).