So, during the Leopard development, I recall reading (sorry, I haven't got links now) that Time Machine wanted to use external hard drives the same size as the drive being backed up. Now, whether that's accurate or not, that's what I've done; I've got a 160gb external hd to backup my 160gb mbp disk. But the backups only date back to yesterday (I installed Leopard perhaps a week ago). This seems intuitive enough, I guess (after all, how could Time Machine magically fit several iterations of your disk on a disk the same size as yours?), but the implications are troubling. Does that really mean that if i accidentally deleted a file two days ago, that it's gone forever? Does that mean I can only recover files that were lost a few hours ago? And isn't there a way to make Time Machine back up your machine, say, twice a day, instead of every hour? I was just charmed by the idea of being able to go back months into history and recover lost files...but being able to travel back only a few hours in time has fairly limited utility value. Also, my MBP hard drive is not full. It's still got nearly 30GB free. That's not enough that you could copy the drive onto a backup twice, but I'd still like to think Time Machine was capable of a bit better. Is this normal? Is there a way to improve it? Thanks.