The previous problem was that the output disc had filled up. Why? It had enough space.
I eventually lit on putting the output to the screen instead of directing it to a file, so I could see what was happening. I eventually figured out that I was getting recursive folders within folders due to ApplicationData being automatically created, then starting over again within that folder. Turns out it was some Linking feature. I found the parm to bypass those "junction links", and it's going again, seemingly well. I'm not seeing those recursive folders, anyway.
And I finally got the commands figured out. There is a lot of difference between having a space in a folder name, a quote mark (maybe the wrong font), a trailing slash, and a source and destination definition that might be the same, or different. Each individual one of these gave me hours of confusion and searching out the answers. Now I have the format saved in file. Oh, it seems simple now, from this perspective...
I have yet to create the massive command file that will take care of all directory copies at once (my ultimate goal.) But I'm getting closer.