Folks- Apologies for a question from a relative newbie (ok, technically I'm returning after a decade away) to the wonderful world of mac. A question about Time Machine... -- I just bought a Macbook Air -- I need a data backup solution -- I have a few spare USB drives lying around -- Someone offered me a free Airport Extreme Will an Airport Extreme + a USB drive plugged into it = a rigged up Time Capsule? I've looked around and seen conflicting info -- I'm concerned Time Machine won't recognize the drive. Am I better off just splurging for a Time Capsule for utterly effortless backup? Thanks in advance!