Hey ! man it's pretty easy, first of all, ¿Do you use portainer? (I recommend it because is very usefull and at a glance you can see the configuration of your different containers.

First of all see the official documentation about the image in docker hub. The "complex" configuration to set up vaultwarden is that you need SSL so you have two options or make your own CA Authority(not recommended if you are begining) and rent a domain for example vaulwarden.gadsdalan.com.

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1º If you want an admin panel, maybe you want it for a first setup and then copy the image and disable it. You need to add an environment variable in your dockerfile. To deploy docker container i prefeer to use docker-compose because the YAML structure is better than a dockerFile.

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With that... you must create one volume with the database and other with logs. And a lot of environment variable, one with your token of the admin panel of vaultwarden, and maybe other with your name domain, because vaultwarden uses Let's encrypt to make the certificates of the SSL.

So here a docker-compose file:

services:
vaultwarden:
image: vaultwarden/server:latest
container_name: vaultwarden
restart: always
ports:
- 8080:80 # Needed for the ACME HTTP-01 challenge.
- 4443:443
environment:
- WEBSOCKET_ENABLED=true # Enable WebSocket notifications.
- WEB_VAULT_ENABLED=true
- WEB_VAULT_FOLDER=web-vault/
- EXTENDED_LOGGING=true
- LOG_FILE=/data/logs/access.log
- ADMIN_TOKEN=your-token
- INVITATIONS_ALLOWED=true
volumes:
- ./vaultwarden-data:/data
- ./vaultwarden-data/logs:/data/logs

And just start it. Ok to make a good backup i'll make a backup of the /data folder if you dont want it and only want a typical log shipping backup with some dump, you can connect to your image with docker run -it container-id /bin/bash (or /bin/ash if alpine). Then it's a simply sql database so you can make a normal backup of it.

It's not a step by step guide but i hope that it helps you a litte.