If you run R, the seedvault settings are accessible via Settings → System → Backup, at least in the dev build I updated to.
(the instructions in the thread head no longer apply for android11 / R seedvault >2.3 builds, see https://github.com/seedvault-app/seedvault/commit/b2cd3c76a3445066846f42fddfa366934b5ef050 - only if it is an App-debug build no permission to open the settings are needed)