by Ken Task.
Uhhh, what's ... 'whole site backup' mean? If it means what I think it means, I'd say one course extract isn't currently possible. But, care to share what got broke? Don't suppose you could restore the old site on a test box, check out the course of add-ons, etc., get a backup of the troubled course, and try the restore of the course.
'spirit of sharing', Ken