Thanks for the hint and the link.
However I have created a new database right at the start and never used the bitnami_odoo DB.
So I did never backup that one.
What is stored there, what is SO IMPORTANT to the bitnami stack that it will stop to work if you delete it??? And if so, why can I delete it?
I plan an upgrade (just before finishing) from 8 to 13. The DB name is something like my_own_database.
How can I use that if I'm bond to the data hold in the bitnami_odoo DB.
I have to have only one DB for using the website functionality!