time machine for Mac OSX

Go back in time
With Time Machine, you can restore your whole system from any past backups and peruse the past with ease. Can't find a file you want? Enter Time Machine - time-based browser to see a snapshot of how your entire system looked on any given day ?file by file. When you find the file you want, just select it and restore it. Time Machine brings it into the present. You can do the same with a group of files, whole folders, even your entire system. With a single click.

It is the most outstanding function of Leopard for Mac OSX, absolutely useful. cost HKD1000....omg ..