So I have read that utilizing an external sata will not allow me to make bootable backups, which as fine as long as it will allow folder synchronization, i.e. itunes folder 1 is different than itunes folder 2, so software compares them and makes them the same. Will this work? Much faster than firewire 400? I take a LOT of photos and also want to be able to transfer them to an external HD much faster...anythign I'm missing or is this just way faster by buying a mac compatibile expresscard and new FW HD case?