I am intrigued by Leopard's new Time Machine feature and I am considering upgrading from Tiger exclusively for this very cool feature alone. However, I just finished building my own time machine and will begin testing the device in the coming days. Assuming everything works, my question is should I bother upgrading to Leopard? Or, should I save the $129 and just travel back in time via my own temporal displacement device in the event of a missing file or a hard drive crash? Keep in mind that my device is designed to only travel backwards in time and then back to present day. I cannot travel forwards in time so please refrain from any "Go to the future and get the next Mac OS" comments. Thanks.