This was done by taking the gitlab redirections and turning it into a
sed script, mostly by hand.

service/crm.md

@@ -684,7 +684,7 @@ Console > View Log.
 Backups are done with the regular [backup procedures](service/backup) except for
 the MariaDB/MySQL database, which are backed up in
 `/var/backups/mysql/`. See also the [MySQL section in the backup
-documentation](howto/backup#restore-mysql-databases).
+documentation](service/backup#restore-mysql-databases).
 
 ## Other documentation