I would like to backup my vaultwarden with ttionya/vaultwarden-backup. I found the linked docker-compose-file but it does not work in my case.

I just learnt - thanks to u/this_is_router and u/inner - that i store my vaultwarden-data in a local folder in the compose-directory, so in my case the dopcker compose looks like this:

services:

  vaultwarden:
    image: vaultwarden/server:latest
    restart: always
    # environment:
    #   SIGNUPS_ALLOWED: 'false'
    #   ADMIN_TOKEN: 'your authentication token'
    ports:
      - '127.0.0.1:8200:80'
    volumes:
      - ./vaultwarden:/data/

  backup:
    image: ttionya/vaultwarden-backup:latest
    restart: always
    # environment:
    #   RCLONE_REMOTE_NAME: 'BitwardenBackup'
    #   RCLONE_REMOTE_DIR: '/BitwardenBackup/'
    #   RCLONE_GLOBAL_FLAG: ''
    #   CRON: '5 * * * *'
    #   ZIP_ENABLE: 'TRUE'
    #   ZIP_PASSWORD: 'WHEREISMYPASSWORD?'
    #   ZIP_TYPE: 'zip'
    #   BACKUP_FILE_SUFFIX: '%Y%m%d'
    #   BACKUP_KEEP_DAYS: 0
    #   PING_URL: ''
    #   MAIL_SMTP_ENABLE: 'FALSE'
    #   MAIL_SMTP_VARIABLES: ''
    #   MAIL_TO: ''
    #   MAIL_WHEN_SUCCESS: 'TRUE'
    #   MAIL_WHEN_FAILURE: 'TRUE'
    #   TIMEZONE: 'UTC'
    volumes:
      - vaultwarden-data:/bitwarden/data/
      - vaultwarden-rclone-data:/config/
    #   - /path/to/env:/.env

volumes:
  vaultwarden-data:
    # Specify the name of the volume where you save the vaultwarden data,
    # use vaultwarden-data for new users
    # and bitwardenrs-data for migrated users
    name: vaultwarden-data
  vaultwarden-rclone-data:
    external: true
    # Specify the name of the volume where you save the rclone configuration,
    # use vaultwarden-rclone-data for new users
    # and bitwardenrs-rclone-data for migrated users
    name: vaultwarden-rclone-data````

If i try to update the stack (in portainer), it says:
"FAILURE: failed to deploy a stack: external volume "vaultwarden-rclone-data" not found"

Sorry for this noobish questions, but i try to learn by those stupid problems.