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offen/docker-volume-backup

Backup Docker volumes locally or to any S3, WebDAV, Azure Blob Storage, Dropbox, Google Drive or SSH compatible storage.

The offen/docker-volume-backup Docker image can be used as a lightweight (below 15MB) companion container to an existing Docker setup. It handles recurring or one-off backups of Docker volumes to a local directory, any S3, WebDAV, Azure Blob Storage, Dropbox, Google Drive or SSH compatible storage (or any combination thereof) and rotates away old backups if configured. It also supports encrypting your backups using GPG and sending notifications for (failed) backup runs.

Code and documentation for v1 versions are found on this branch.

  1. Quickstart
    1. Recurring backups in a compose setup
    2. One-off backups using Docker CLI
  2. Available image registries
  3. Supported Engines
  4. Differences to jareware/docker-volume-backup

Quickstart

Recurring backups in a compose setup

Add a backup service to your compose setup and mount the volumes you would like to see backed up:

services:
  volume-consumer:
    build:
      context: ./my-app
    volumes:
      - data:/var/my-app
    labels:
      # This means the container will be stopped during backup to ensure
      # backup integrity. You can omit this label if stopping during backup
      # not required.
      - docker-volume-backup.stop-during-backup=true

  backup:
    # In production, it is advised to lock your image tag to a proper
    # release version instead of using `latest`.
    # Check https://github.com/offen/docker-volume-backup/releases
    # for a list of available releases.
    image: offen/docker-volume-backup:latest
    restart: always
    env_file: ./backup.env # see below for configuration reference
    volumes:
      - data:/backup/my-app-backup:ro
      # Mounting the Docker socket allows the script to stop and restart
      # the container during backup and to access the container labels to
      # specify custom commands. You can omit this if you don't want to
      # stop the container or run custom commands. In case you need to
      # proxy the socket, you can also provide a location by setting
      # `DOCKER_HOST` in the container
      - /var/run/docker.sock:/var/run/docker.sock:ro
      # If you mount a local directory or volume to `/archive` a local
      # copy of the backup will be stored there. You can override the
      # location inside of the container by setting `BACKUP_ARCHIVE`.
      # You can omit this if you do not want to keep local backups.
      - /path/to/local_backups:/archive
volumes:
  data:

One-off backups using Docker CLI

To run a one time backup, mount the volume you would like to see backed up into a container and run the backup command:

docker run --rm \
  -v data:/backup/data \
  --env AWS_ACCESS_KEY_ID="<xxx>" \
  --env AWS_SECRET_ACCESS_KEY="<xxx>" \
  --env AWS_S3_BUCKET_NAME="<xxx>" \
  --entrypoint backup \
  offen/docker-volume-backup:v2

Alternatively, pass a --env-file in order to use a full config as described below.

Available image registries

This Docker image is published to both Docker Hub and the GitHub container registry. Depending on your preferences and needs, you can reference both offen/docker-volume-backup as well as ghcr.io/offen/docker-volume-backup:

docker pull offen/docker-volume-backup:v2
docker pull ghcr.io/offen/docker-volume-backup:v2

Documentation references Docker Hub, but all examples will work using ghcr.io just as well.

Supported Engines

This tool is developed and tested against the Docker CE engine exclusively. While it may work against different implementations (e.g. Balena Engine), there are no guarantees about support for non-Docker engines.

Differences to jareware/docker-volume-backup

This image is heavily inspired by jareware/docker-volume-backup. We decided to publish this image as a simpler and more lightweight alternative because of the following requirements: