Hello... hoping someone can help me answer this setup question. I currently have a MacPro backing up to my 2tb time capsule hard drive over wireless. Is it possible to add a 250gb external HD via USB to the time capsule and then have another system (MB Air) backup over wireless to the 250gb drive only? What I am trying to achieve is that Pro continues to back up only to the 2tb capsule and the Air only uses the 250gb external. So both systems backup to independent hard disks or does the 250gb just become an extension of the 2tb and all the backups are convoluted into 1 giant mess? I couldn't find the answer by searching so I appreciate any help on this one. Thanks..