Sorry if this a really basic question, but... How does one create a Time Capsule-esque device? I.E. a shared, wireless hard drive that I put movies on to watch on my laptop and PS3, plus a place to synch with Time Machine without tethering to a box. Does one need to build a Linux server to create such a set-up or is can it be done with just a wireless router and an external hard drive? If so, what would such a configuration be called?