SQL query for Moodle to show space usage in User Private Backup Area by user

MoodleUserPrivateBackupArea.sql

SELECT CONCAT(mu.firstname, ' ', mu.lastname, ' (', mu.email, ')' ) AS Teacher, 
	ROUND((SUM(mf.filesize)/1024)/1024, 2) AS Storage_Used_MB
	
FROM mdl_files AS mf
LEFT JOIN mdl_user AS mu ON mf.userid = mu.id

WHERE mf.component = 'user'
AND mf.filearea = 'backup'
AND NOT mf.filename = '.'

GROUP BY mf.contextid
ORDER BY Storage_Used_MB DESC