My situation: I keep all my photos and Lightroom library on an external Firewire 800 drive with FW 800 backup drives. I just purchase the new Macbook Pro Retina and you all know that a Firewire 800 port no longer exists. For my working photo catalog I will use a portable USB 3 drive that doesn't require a power cord (bus powered). However, I would like to continue to use my Firewire 800 drives for backups. What would be the most convenient or affordable option? Is there a FW 800 to USB 3 adapter? If so I haven't found too many. Anything thunderbolt seems ridiculously expensive at this time.