Ok - will read the relevant section of the manual again. @rmschne
Why?
Because I would like my wife to be able to access the documents should I not be around (morbid 
). She does not use DT3. So, I wondered if it would be better to have all scanned documents and bills and notes outside of DT3 and sync with out Mac mini so that the documents are on the Mac mini also not only on my laptop.
They are still being backed up from the DT3 but not accessible to others.