I have a couple concerns about the Secure Zone. Since you cannot see what files are being saved in the Secure Zone, how exactly does it work? #1) When I save a new backup image here, is the old file simply replaced? #2) Can the Secure Zone hold more than one file? #3) How about incremental or differential backups? I guess being that you cannot see and select files in the Zone, that you cannot add an incremental or differential... right?