I'm currently using TimeMachine and SuperDuper to back up my Air. I read somewhere that CCC backs up your Recovery HD whereas SuperDuper doesn't. What's the practical implication/advantage of that? When I travel, I'd prefer to only bring one external hard drive along. Would it make sense to bring the one where I back up with TimeMachine or the one with SuperDuper? I back up to two separate drives that are partitioned, so both drives have one back up area and one general storage area. I guess the criteria would be whether I'd be worried about wanting a previous version of particular files (TM), or worried about the whole system crashing (SD) - is that right? I can't quite decide what would be most strategic.