D1 added mysql DB to all backup. May be letter to add it to new backup? Or create backup what copy all backup db and main db? Now I have this the backup at home).
Backing up the Duplicati database is generally only useful to improve restore times if the main database is lost OR to move the entire job to a new machine.
Restores can be done without the database at all, though they will be slower than if the database existed.