I've read a few threads and gleaned a bit of info but I've got some other questions about the best way to go about this. To start with I've got 2 emacs and I'm waiting on delivery of a new la cie 250 gig HD. I've downloaded super duper as that appears to be the best app. What I want to do is have a bootable clone of each mac. 1. I guess I should create a partition for each mac and one for storing new files? Is this right. Is there any reason why I would want to create more than 3 partitions? I planned on using the rest of the HD space to dump lots of big files. Also both the emacs are networked together via an ethernet cable and ADSL router, can I leave the ext HD connected to one mac on a firewire connection and still be able to dump files to it from the other mac? Can I make a bootable clone of the mac that isn't directly connected to the ext HD via the network or does it have to be directly firewire connected.Is there a better way to do this. 2. I originally had the idea to back up all my newly created big files but I just realised that to back up I'd have to have them on my emac which is too small so that means I won't really be backing up but just storing all my new stuff on the ext HD. So my question is, is an external HD like a La Cie less likely to spontaneously go badly wrong than my internal drives?