volgens Ken Task.
How many backups are to be retained? That setting supposedly applies to backups regardless if automated or 'normal'.
See if it's really working: move all the backups in C:\moodlebackup out into another folder.
In the admin/cli/ folder of that version there is a automated_backups.php script. For testing, might try to use that rather than cron.
Then run the cron.
'spirit of sharing', Ken