for example if you had 5tb worth of photos and music ect and you could not afford i nas. could you every 3 months buy a 2tb nas for example wd my book live and add them all to my bt hub. each going back not daisy chain them. but if i then went to the cpu would they get confussed with each other or have they all got there own id. Plus i may want to take one around or back up files and leave somewhere safe off my flat.