We've got the same problem in 2.2. Kind of annoying when the backups for the course don't appear on the 'restore' page.
Backup and restore
Moodle 2.4 won't backup outside of the Moodledata folder
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។