I have just tried KR.
I should start by sharing some information that was not obvious to me as a beginner/amateur, in case it helps anyone else. On the first run it reported that the job was completed successfully with no failures, but it did not copy any files. I have since worked out (by trial and error) that the user account running the program needs to be named in the security permissions lists for each folder to be backed up - it is not sufficient that it is an administrator account and that administrator accounts appear in those lists. This seems odd, but there it is.
Now for my question. When I backup the My Documents folder to a separate external hard drive using the 'echo' function, why do empty My Music, My Pictures and My Videos folders mysteriously appear in the destination folder when they are not in the source folder? And how can I stop them appearing? When I delete them from the destination folder, they reappear when the job is next run.
I do have hidden folders and files visible, so they really aren't in the source folder.
The 'real' My Music, My Pictures and My Videos folders - together with their contents - are copied across correctly in the right place.
This is a nuiscance as well as a mystery - I was comparing the properties of the source and destination folders as a check on the backup process, and this shows as an error.