I guess I failed to say that I had downloaded FreeFileSync and unpacked the TAR, but could not get it to work.
I used Google and found several places on the web that gave instructions (usually 2-4 years old) but none worked.
I found no instructions in the TAR file. I guess I expect instructions as well as the TAR file and find nothing.
If anyone has gotten FreeFileSync working with Ubuntu Mate 16.04 I would sure appreciate learning what they did.
In the meantime, I will check out the alternatives I see posted.
Thanks again,
Larry