I have been racking my brain since I got my Time Capsule getting it to work. It basically will stop at some point and just not continue with the initial back up. I tried everything under the sun, and then tried everything under the sun again with Apple tech support and then with a product specialist (the next tier up). I finally made the connection that whenever I start an audio recording in QuickTime Pro, Time Capsule comes to a screeching halt. I happen to use QT Pro for this purpose quite often, and finally made the connection. I wonder if this is a bug in general, on my system, or if it somehow logically makes sense that no backup would be able to take place at the same time as an audio recording? Other than that, I seem to be able to use my system while it's doing its initial back-up. Has anyone else come across this?