services:
  backup:
    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
    environment:
      BACKUP_FILENAME: "backup-$${BACKUP_TAG}.tar"
      BACKUP_FILENAME_EXPAND: true
      BACKUP_TAG: expanded
      BACKUP_SOURCES: /backup
      NOTIFICATION_URLS: "stdout://"
      AWS_S3_BUCKET_NAME: example-bucket