I have a Time Capsule as my Time Machine backup, which backs up my MBP and the external drive I use to hold all my files. The initial backup was roughly 400GB--325GB of which is iTunes related. The initial backup--which I have done numerous times now--went fine. However, the next time I have the external drive connected, when Time Machine starts up to do its hourly incremental backup--it shows XXGB of 365GB ... so it is trying to re-backup my entire iTunes library. Anybody have this problem and find a solution?