I have a TM drive I been using with my macbook air all fine. Got a new combo enclosure with a hdd and dvd in one box. So copied data from the TM drive to new hdd in box. then opend TM and pointed it to new drive. Last time I did this on my macbook pro 2007 it asked if I wished to inherit the TM. I said yes. But this was with El Capitan. With sierra in my air it not not as to inherit and just started a full now backup. Is there a way to force inherit? Just that starting over I cannot go back through the old backups on this drive, only on the old backup drive. I bought this combo box save on extra items I need carry around with my air as all in one box not several.