I am reading the live coverage of WWDC keynote here:
http://www.macrumorslive.com/web/

They talked about a new feature in OS X/Leopard: "Time Machine".
Does it sound like instant snapshot and rollback to you?
I don't know how else this can be implemented.

10:37 am    with time machine, you can get those files back by
            entering a date or time
10:35 am    ever had time where you work on a doc and you do a
            save as and overwrote the wrong one?
10:35 am    coolest part - and reason we call it that
            - whole new way of backing up files
10:35 am    backup to HD, or server
10:35 am    can restore everything, or just one file at a time
10:34 am    can be right where you were when the HD drive
10:34 am    automatically backs up mac you change a file,
            it automatically backs up photos, music, documents,
            files folder, everything then you can restore everything
10:34 am    plan to change all of that
            Time Machine
10:33 am    how many use automated software to stay always backed up?
            only 4%

Tao
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