minio_backup-docker-compose.yml

version: '3'

services:
  minio:
        image: 'bahorn/minio:latest'
        command: minio server /data
        restart: always
        ports:
                - '9000:9000'
        volumes:
                - /mnt/compute:/data:rw
        environment:
                MINIO_ACCESS_KEY: a1
                MINIO_SECRET_KEY: s1

  minio_gateway:
        image: 'bahorn/minio:latest'
        command: minio gateway --address 0.0.0.0:9001 b2
        restart: always
        ports:
                - '9001:9001'
        environment:
                MINIO_ACCESS_KEY: a2
                MINIO_SECRET_KEY: s2
        volumes:
                - /mnt/compute:/data:ro
  private_backup:
        image: 'bahorn/mc:latest'
        command: mirror --exclude ".*" --overwrite --remove -w /data bb/<private_bucket>
        restart: always
        volumes:
                - /mnt/compute/private:/data:ro
                - /srv/mc:/root/.mc:ro
        depends_on:
                - minio_gateway

  public_backup:
        image: 'bahorn/mc:latest'
        restart: always
        command: mirror --exclude ".*" --overwrite --remove -w /data bb/<public_bucket>
        volumes:
                - /mnt/compute/public:/data:ro
                - /srv/mc:/root/.mc:ro
        depends_on:
                - minio_gateway

Containers are ones I built as the machine is ARM based (A Nvidia TX2) and the official builds are only PPC/x86_64.