Time Machine keeps backing up more than I have
Before I started running Time Machine on a brand new WD 2T My Passport, it said I had 601GB to back up. After 5 DAYS (!!) it finally reached the 601 GB but just kept going. (BTW I needed to restart he computer several times to nudge the backup along!) The progress bar has been stuck on 100% for 24 hours but it is still "Backing up". I have not made any changes (that I'm aware of) to machine since I started the backup.
What is going on? I don't want to wipe the WD disk and start again because my transfer rate is coming out at about a 3.5 GB/hr (over USB3 from a 2014 iMac). It would take another 5 days or so.
What should I do?
Thank you.
iMac Line (2012 and Later)