Answered by : foolish-ferret-646ea219zki0

mysqldump --single-transaction --default-character-set=utf8mb4 -h [server] -u [username] -p[password] [db_name] > nextcloud-sqlbkp_`date +"%Y%m%d"`.bak

Source : https://docs.nextcloud.com/server/latest/admin_manual/maintenance/backup.html | Last Update : Tue, 01 Feb 22