I think in docker you just have to make sure that the working directory is a volume and is persistent. - this needs to be backed up.
here are all the default env vars:
https://github.com/getAlby/hub/blob/master/config/models.go#L16-L45
But I think only the WORK_DIR is really only the relevant one for docker. like you see here: https://github.com/getAlby/hub?tab=readme-ov-file#docker
or here in this docker compose file: https://github.com/getAlby/hub/blob/master/docker-compose.yml#L11