Before you say "time machine", let me explain a little. I have 1 2TB Time Capsule and a 4TB Seagate External Hard Drive. For my mac mini/media server, I want to use both for backup purposes. I know Time Machine does this, but my understanding is that it does it backup redundantly. It will do a full backup on each drive. I want to be able to use the 4TB Hard Drive, and then once it runs out of data, have the backup move onto the 2TB Time Capsule drive. So, not to backup redundantly, but really have a "6TB" backup space. I thought this was how the Time Machine backup worked when using multiple disks...but I was wrong. Anything else out there that can fit the bill? Or am I SOL?