Are you running Leopard? If so, then why not just plug the LaCie drive in, let Time Machine do its backup of everything, and then bring your computer to Apple. If they put a new drive in it, then when you get back home and start it up for the first time, plug the LaCie drive back in and tell it to import all of the Time Machine files. I'm pretty sure you can do this, but correct me if I'm wrong. It would be like using migration assistant on a new Mac to transfer all the files from an older Mac. If the Time Machine restore works like that, then your desktop, user preferences, and everything else will be exactly the same as before you brought it in. This seems like the easiest way. Hope this helps.