I closed my database, quit DT and entered TimeMachine at a few weeks back. In the first case, I would have my external drive with access to TimeMachine. First, something happens to my Mac and I have to restore from TimeMachine or secondly both my Mac and External drive are gone/toast. I use TimeMachine as primary, but also iDrive for remote. I have questions about restoring from backup and found this related post from a couple of years ago.
