Hey there! Recently purchased my first mac - a MacBook Air. Really liking it so far, still getting used to it, but enjoying it. Obviously the Air has no CD drive - how do you reinstall OSX if required? Should I be making a backup of some sort? I see no recovery drive type of set up like I'm used to with recent Windows laptops. I'm looking at installing the OSX 10.9 Mavericks beta, so looking at how to go backwards if required. Thanks for your help!