by Ken Task.
Could do this ... install course size report ... run it. Determine which are the larger courses - which are the smallest courses.
From command line, use the moodlecode/admin/cli/ backup.php script that is in a script and loops through a listing of courses to backup. List might include 2 large course and small courses. Two of three of these list. Run them under an operating system cron.
It's a work around, but ....
'spirit of sharing', Ken