Time Machine in Leopard
I have a startling revelation. Wait for it, wait for it -- Steve Jobs engages in hyperbole! Specifically, here's a quote from http://www.apple.com/macosx/leopard/timemachine.html:
As you make changes, Time Machine only backs up what changes, all the while maintaining a comprehensive layout of your system. That way, Time Machine minimizes the space required on your backup device. Since backups are stored on your device by date, you can browse through your entire system as it appeared on any date. And that’s what makes Time Machine different from any backup application you’ve ever tried.Of course it's easy to miss the fine print:
... different from any backup application except rsync.