Syncthing - Peer-to-Peer File Sync

Syncthing keeps folders in sync across laptops, desktops, and servers without Dropbox-style central storage. Devices connect peer-to-peer with encrypted traffic; you choose which folders are shared and with whom.

Key Features

• Continuous Sync: Changes propagate as devices come online.
• No Cloud Required: Direct device-to-device (relays only help NAT when needed).
• Encryption: Traffic protected between nodes.
• Selective Sharing: Share specific folders to specific devices.
• Versioning: Keep old file versions when something is overwritten.
• Everywhere: Native clients and Docker for servers; mobile companions available.

Why Choose Syncthing?

• Dropbox/iCloud fees scale with family data.
• Nextcloud is great but heavier if you only need sync.
• Photos, projects, and configs should mirror across machines privately.
• Homelab classic with decades of reliability.

Docker Deployment

services:
  syncthing:
    image: syncthing/syncthing:latest
    container_name: syncthing
    hostname: syncthing-server
    environment:
      - PUID=1000
      - PGID=1000
    volumes:
      - syncthing-config:/var/syncthing/config
      - /path/to/data:/var/syncthing/data
    ports:
      - "8384:8384"   # Web UI
      - "22000:22000/tcp"
      - "22000:22000/udp"
      - "21027:21027/udp"
    restart: unless-stopped

volumes:
  syncthing-config:

Open the UI on 8384, add devices by ID, then share folders.

Getting Started

1. Install Syncthing on two devices.
2. Exchange device IDs and approve introductions.
3. Share a test folder and confirm sync.
4. Add ignore patterns for node_modules, caches, etc.
5. Optional: run a always-on NAS/VPS node as a sync hub.

Full Setup Guide

syncthing.net · github.com/syncthing/syncthing. Homelab context: BitDoze home server containers.