I would like to back up my nextcloud data using duplicati, but I absolutely can‘t figure out how to give Duplicati access to the Nextcloud volume. Both are running fine in separate Docker containers. I can’t figure out how to properly mount the volume, below is my current compose for duplicati. Do I need to mount the volume as source? Does it need to be declared or mapped separately?

---
version: "2.1"
services:
  duplicati:
    image: lscr.io/linuxserver/duplicati:latest
    container_name: duplicati
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=XXX
      - CLI_ARGS= #optional
    volumes:
      - /path/to/appdata/config:/config
      - /path/to/backups:/backups
      - /path/to/source:/var/lib/docker/volumes/073ac2751cd65ffd84750e578c38482905c3c7e4851a8cbb0bbbc5c33a285e84
    ports:
      - 8200:8200
    restart: unless-stopped
  • @[email protected]English
    1•1 year ago

    Why are you mounting the volume with the file system path, instead of the volume name? You should be able to mount the volume normally by specifying it in the volume section, i.e.

    services:
  duplicati:
    volumes:
      - nextcloud_data:ro

volumes:
  - nextcloud_data
    - external: true

    That should grant Duplicati read-only access to the entire volume without messing around with absolute file paths.

    • @avnrtOPEnglish
      1•1 year ago

      Thanks, I didn’t fully understand the syntax before. I now see the volume in the duplicati GUI, but not its contents. When I just back up the entire volume, the backup size is basically zero (should be more like 800MB).