I have recently configured an AEBS with an external USB drive and in another part of the home have added a Time Capsule with a 500 meg drive. I have all my music files and photos on the USB drive and use them in iTunes and iPhoto. I made a backup of them (really just a copy) by dragging them from one drive to the other so I have an exact copy now on the TC. It took quite a while to copy all 110 gigs of files but it completed successfully. I'm wondering if there is some application that could 'monitor' the folder on the USB drive and automatically copy the changes to the TC?