by Ken Task.
Backups in the 'Course Backup Area' are backups whose backup options were defaults.
See your sites: /admin/settings.php?section=coursesettings
Admin menu -> Courses -> Course Default Settings
Did you change those after running some backups?
Backups in the 'Private User backup area' ... When backup courses with "Anonymize user information" option ticked, backup files will be stored here
'spirit of sharing', Ken