This is my first Mac, a MacBook Air 13" running Lion. I've been researching backup software other than TimeMachine and would like to know what other Mac users like. Because it's an Air, my backup hardware options are external USB 2.0 hard drive, external USB 2.0 DVD drive, and USB 2.0 Flash Drive. My research has left me with ChronoSync vers.4.2.3 which is Lion compatible (from www.econtechnologies.com). But I would like to hear other users' opinions of this app -- good and bad -- as well as suggestions of other backup software.