My Time Machine has been making the usual regular backups for a few months onto my Time Capsule. I just found that all the backups prior to about a week ago have vanished. It's not a disaster (I think) as I assume that the current backups reflect what's on my iMac (I haven't had to delete files from it yet). Where did they go? Why did they go? A possible connection: My TC is 500GB; my iMac 1TB. I recently put extra files for temporary use onto the iMac hard drive - Time Machine said (in effect) 'that's too much, try removing certain folders from the backup'. I excluded said folder and things seemed okay, but it would be at around the time I did that that my old backups have gone. What do you guys think? Have I messed up and how do I avoid a repetition?