What do you think would be my best bet. I currently own an Airport extreme and a WD My Passport 2TB usb 3 drive. I would like to setup a wireless time machine backup. Is my best bet to go with what I already own or to buy a 2TB time capsule and set that up instead? I would like to put other files on it as well. Example my movies, game installers, etc to save room on my os drive. I probably have 1tb worth of data I would like to have then have 1tb for a back up.