I'm not sure where to post this question, but I think this forum is as good as any. So, I'm preparing to upgrade my 2007 MB to a 2012 13"/128SSD MBA in the next week or so. I currently keep all of my music (which is in Apple Lossless) and videos on an external HD and I access it through my Airport Extreme. Is there an easy way to back up an external drive to another external HD? I have SuperDuper, but I don't believe it's possible to do what I want to do. I just don't want to rely solely on one copy of my iTunes and video libraries.