New if() to add the id or the shortname to the regexp, the same process backup_plan_dbops::get_default_backup_filename() does, by Lorenzo Nicora. Another way to get the regexp could be calling backup_plan_dbops::get_default_backup_filename() and hacking it's return to remove the last -*, but IMO this alternative is more tricky

These testing instructions includes the execution of automated backups, so less courses = faster automated backup

1.- Enable automated backups with this setting:
.backup_auto_active to 'manual'
.backup_auto_storage to 'Specified directory for automated backups'
.set backup_auto_destination wherever you want
.backup_auto_keep to '1'
.check backup_shortname
2.- Execute "sudo -u www-data /usr/bin/php admin/cli/automated_backups.php" from the command line
2.- Execute again "sudo -u www-data /usr/bin/php admin/cli/automated_backups.php" from the command line
3.- Check backup_auto_directory folder, there SHOULD be just one backup file per course