I bought a new 320 GB Firewire WD external drive 'cause my old one's too small and I have horrible luck so the first time I actually needed a backup the file just happened to be in the one folder I told Time Machine not to back up, twice. I already have a full backup on the 160GB drive that's connected via USB right now. Can I just connect the new one via Firewire while the old one's connected and drag & drop the Backups.backupdb folder to the 320 GB drive? Will Time Machine just use that folder and add on to it rather than backing up the whole system again?