I ran into some problems while installing Leopard. I keep getting the "You cannot install Mac OS X on this volume. To enable installation on this volume..." So I know I need to partition my disk as a "GUID partition table", but I read that that will erase everything on my drive. I need to do a backup, but I'm a little confused. First of all, I don't have an external drive and was thinking I would subscribe to an online service for a month. I know I probably need to buy a drive, but I just can't afford one right now. So my questions are... can I use Retrospect or SuperDuper for one of these online services, like IDrive? And if so, how exactly do I set Retrospect/SuperDuper up for that? Then, if I do backup this way, will it be easy for me to restore my apps, docs, pics, and music after I partition my drive? I don't understand what form the data will be in after I get it backed up. Thank you in advance for your help!