Mendota wants an alternative to Time Machine for backing up his computer. Leo says he's not a fan of Time Machine. He recommends SuperDuper because it can be bootable. Time Machine is a dumbed down, simpler backup solution "for the rest of us." But that ease of use is more dangerous because it's too easy to assume you've backed everything up and can restore it. SuperDuper will not only backup Mendota's hard drive to his external drive, but it'll be bootable and SuperDuper will also constantly update it, so that if he needs to, he can reboot to an identical drive immediately.