I go to Project –> project manager –> create trimmed project after this is saved out I simply back it up on a few DVDs. It usually takes about 3-5 DVDs but the project is good to go. Using this feature allows all the junk and unused files to be trimmed out. You can also choose how much of a handle you want on your AVIs just in case you need to work with it again. I can take a 40-60 gig project and trim it down to approx. 15-20gigs.
James