services:
  spectarr:
    environment:
      SPECTARR_BACKUP_ROOT: /backups
      SPECTARR_BACKUP_IMAGE: ${SPECTARR_BACKUP_IMAGE:-}
    volumes:
      - type: bind
        source: ${SPECTARR_BACKUP_DIR:?Set SPECTARR_BACKUP_DIR to an existing backup directory}
        target: /backups
        bind:
          create_host_path: false