I have an airport extreme that is currently connected to a printer so that we can print. I want to add a hard drive to back up all the computers with time machine. They are all apple computers running leopard. I was considering buying the time capsule, but was wondering if I used a usb hub and an external drive, would this work as well also. Not trying to run any programs on the hard drive. Just want a back up in case something dies. I guess my question is should I buy a time capsule or will the external HD, usb hub route work as well.