I wasn't sure where else to put this and I know people here have TimeMachine/backup experience. I don't know if this is true after every system software update, but after applying 10.5.6, Time Machine wants to backup 70GB worth of stuff. That's an additional 70GB worth of space taken up on my backup drive. I'm guess that that is all of the file differences because of the update? it so happens that I have a little over 71GB worth of stuff on my drive total. (What can I say, I leave a small footprint and archive a lot off disk). So it basically wants to back up my entire drive all over again. Is this normal? I could nuke the existing backup and just start fresh and not be concerned with losing anything. [Bump for post moved from different forum.] Anyone?