Guide: MinIO as an S3-Compatible Backup Target

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Self-hosted S3-compatible object storage for backups: MinIO behind an Nginx proxy, with an rclone-based backup agent and versioned buckets. Your offsite backups without a cloud bill.

What this is

A deployment guide with working examples — not a downloadable product. Everything below is the actual configuration I use, abridged to the parts that matter.

Deployment example

services:
  minio:
    image: minio/minio:${MINIO_VERSION:-RELEASE.2025-09-07T16-13-09Z}
    container_name: minio-server
    restart: unless-stopped
    command: server /data --console-address ":9001"
    ports:
      - ${MINIO_API_PORT:-9000}:9000
      - ${MINIO_CONSOLE_PORT:-9001}:9001
    environment:
      MINIO_ROOT_USER: ${MINIO_ROOT_USER:-minioadmin}
      MINIO_ROOT_PASSWORD: ${MINIO_ROOT_PASSWORD:-change-me}
      MINIO_DOMAIN: ${MINIO_DOMAIN:-minio.example.com}
      MINIO_BROWSER: ${MINIO_BROWSER:-on}
      MINIO_PROMETHEUS_AUTH_TYPE: public
    volumes:
      - minio-data:/data
      - ./config/minio:/etc/minio:ro
    healthcheck:
      test:
        - CMD
        - curl
        - -f
        - http://localhost:9000/minio/health/live
      interval: 15s
      timeout: 5s
      retries: 5
      start_period: 10s
    networks:
      - storage
  backup-agent:
    image: minio/mc:${MC_VERSION:-RELEASE.2025-08-13T08-35-41Z}
    container_name: minio-backup
    restart: unless-stopped
    entrypoint:
      - /bin/sh
      - -c
    command:
      - |
        # Configure alias for local MinIO
        mc alias set local http://minio:9000 \
          ${MINIO_ROOT_USER} ${MINIO_ROOT_PASSWORD}

        # Configure alias for remote backup (if configured)
        if [ -n "${BACKUP_ENDPOINT}" ]; then
          mc alias set remote ${BACKUP_ENDPOINT} \
            ${BACKUP_ACCESS_KEY} ${BACKUP_SECRET_KEY}
        fi

        # Run backup script on schedule
        while true; do
          echo "[$$] Running backup at $$(date)"
          sh /config/backup.sh 2>&1 || echo "Backup failed"
          sleep ${BACKUP_INTERVAL:-86400}
        done
    volumes:
      - ./config:/config:ro
    depends_on:
      minio:
        condition: service_healthy
    networks:
      - storage

Excerpt — minio, backup-agent from the compose file. The remaining services (proxies, init jobs, exporters) follow the same pattern and mount their configuration from a config/ directory.

Essential environment variables

Copy .env.example to .env and at minimum set:

MINIO_VERSION=latest
MINIO_API_PORT=9000
MINIO_CONSOLE_PORT=9001
MINIO_ROOT_USER=minioadmin
MINIO_ROOT_PASSWORD=change-me
MINIO_DOMAIN=minio.example.com

Production checklist

• Set a strong MINIO_ROOT_PASSWORD (24+ chars)
• Configure HTTPS via external reverse proxy (Nginx/Caddy/Traefik)
• Enable MinIO erasure coding for multi-disk resilience
• Set BACKUP_RETENTION_DAYS for automatic cleanup
• Monitor with Prometheus (/minio/v2/metrics/cluster)
• Pin MINIO_VERSION to a specific release for production
• Set up regular mc admin heal on degraded drives

A guide, not a product. This page is deployment documentation with working examples — there is no zip, no download, no support contract. You adapt the patterns to your own environment, and you own the result.

Want this running production-grade in your infrastructure instead? Backup architecture like this is part of my infrastructure consulting — details on the consulting page: €1,000/day, remote or on-site, invoice as usual.