Thanks for the reply but I don't know what you mean. What set up procedure are you referring to - the one where I tell the back-up program what kind of back-up I want (I use the recommended one, as i have always done) or are you suggesting that I should delete my Lightroom folder then re-add it?
As I mentioned in the earlier post, all the other folders in c/users/owner were happily saved to the back-up. These included Appdata, Contacts and Favorites among others. There were no problems with the F-drive
If it's of any help, I look at the back-up folders using:
control panel/backup & restore/restore my files/Browse for files (or folders)