Now, im not exactly sure what a nas is, but i suspect it is like a network drive. If that is so, i do not want to use that because then it takes too long to transfer (56mbps vs 360mpbs, and i think bluetooth is actually like 1gbps but im not sure.) anyways, if i was going to go with a network option then i would upgrade to draft n and get a cheap computer (99 refurbished at microcenter) and use it as a file server for the entire network. which then wouldn't be usb, it would be an internal 1 tb raid. which would be too expensive until i can get a job. (im 14, can work at hy vee at 15)
so basically the answer is transfer time. I tried to transfer 8 gigs of data from one computer to another, and it took more than 1 hour, over usb it only took about 1.5 minutes to trasfer to my external.
You mentioned that this may be accomplished over wifi: if you know of a specific product i could look at, that would be great, but if not, then do you think i could still use my internal wireless card to connect to a network for internet as well as connect to the device that i would be converting?