Hiya folks I have a 1tb usb drive pluged into my airport extreme. I can see the drive just fine, it's mounted on my desktop right now. But I want to get Time Machine to use it for backups... But when I try to set up time machine, it doesn't list the network drive in the list. So is there a way I can get it to work? Or will I just have to plug the drive into my Mac instead (which I don't wanna do)?