I finally figured out the problem.  When I would tell it to backup it would say it could not find the old files that were evidently very old or something.  Anyway when I told it to forget the old files and just update on a daily basis on  drive F: it worked and is fine now.
Yesterday I noticed on the bottom right of my screen under Notifications, the following message. Reconnect your Drive Your files will be temporarily copied to your Hard Drive until you reconnect your file history drive and run a backup. I'm sorry, but I am not sure what caused this, what they are talking about or how to reconnect the drive they are addressing.  Help would be much appreciated as to what this means and how to correct it,  Also, what could have caused this?  Thanks for any help.
XPS 8930, help with "Reconnect your drive" ?