Cloud backup skips 2, now 3, files every times

I have been using the cloud backup for the last month or so and it seems to work fine, with one problem.

Each time the backup runs, 3 text files that I use and update every day are skipped. I get the same error message each time: Could not contact server [801]. It was 2 files, now a third shows up in the error area.

This happens even if the files are not in use. I also tried deleting the document folder they reside in from the backup. When i ran the backup, I received no error messages, but as soon as I added the document folder back into the backup, the same error message showed up (and the files were not open).

Any idea how I can force these files to be updated? Thanks.