The page /moodle/backup/log.php has the following breadcrumbs:
Moodle > Administration > Configuration > Backup > Logs
The Configuration and Backup links give HTTP 404 page not found errors.
Configuration points to: /moodle/admin/configure.php (page doesn't exist, no need for link?)
Backup points to: moodle/admin/backup.php?sesskey=EuQcOpmXHr (should this be moodle/backup/backup.php)
Breadcrumbs are set in moodle/backup/log.php line 39 and 87.