Dockerized Borgbackup

authorized_keys

command="borg serve --restrict-to-path /mounted_backups/backup_bla/" ssh-rsa <pubkey>

docker-compose.yaml

version: "2.1"
services:
  server:
    image: borgbackup:latest
    hostname: borgbackupserver
    environment:
      # Used because of file system permissions of mounted storage
      - PUID=<UID>
      - PGID=<GID>
      # SSH username
      - USER_NAME=borgbackup
      - TZ=Europe/Berlin
      # public key that is allowed. Multiple possible. See linuxserver/openssh-server
      - PUBLIC_KEY=<SSH pub key>  # e.g. ssh-rsa ABCDEF...
      - SUDO_ACCESS=false #optional
      - PASSWORD_ACCESS=false #optional
    ports:
      - 3333:3333  # Port you like
    restart: unless-stopped
    volumes:
    # Where to store the backups
    - "/volume1/BorgBackups:/mounted_backups:rw"

Dockerfile

FROM linuxserver/openssh-server:latest

RUN apk add borgbackup