SDAgent xxx is not running as root

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I keep getting this error in the log when I run a backup that I have been doing for years. The 1TB backup usually takes less than ten minutes each time I do it (I write down the time), I noticed today it was taking 20 minutes at first step so I knew something was wrong. The log showed the root error in red.

I saw a very old thread with similar title here so, after a reboot, I tried the main window lock-unlock method but I got the same error on the next backup try.

After the root error, there is a page of red errors in the log, but I'm guessing they all stem from the root (just saw my pun there) so unless you need the log...

btw, each time the SDAgent error occurs it shows a different #

Any suggestions?