by josh love.
No worries Przemek, the weird thing was that none of these files were being used within the course. So deleting them should have no effect on the back-up/restore process. I made a copy of all the files before I did delete them so I can bring them back if needed.
I am just glad my course is now 1.2MB instead of 28.9MB
That eliminated one possibility of why my course isn't backing up.