Hi. I'm thinking of purchasing Time Capsule to go along with my new MacBook Air ^_^ . But I'm not sure of its privacy aspects. It would be used as a family router, and possibly be used to backup other computers. But are the backed-up directories with my computer files available to be browsed on the hard drive? Also, is it possible to mount a usb hard drive to the usb slot at the back for backup or general storage? If it is, what are the privacy settings for the content? Thanks so much - I'm struggling to find this info on their store, or anywhere! I really appreciate it.