Theming App Logo Path

Nextcloud version : 13.0.1
Operating system and version: Debian Stretch on Raspberry Pi 3
Apache or nginx version : Apache2
PHP version : 7.0

I’m searching for the location of my Logo which I uploaded via the Theming App after I lost it on my Notebook and my USB-Drive. Is it saved somewhere in the File-/Data-Directory or in the Database? And if in DB can I export it somehow?

Thank you in advance.