How to Set Up File Synchronization with Syncthing on Windows and Linux

Introduction to Syncthing

File synchronization is essential for keeping data consistent across multiple devices, whether you are working from home, the office, or on the go. Syncthing is a popular open-source tool that allows secure, decentralized file synchronization between computers. Unlike traditional cloud services, Syncthing does not store your files on third-party servers, giving you full control over your data. In this tutorial, you will learn how to install and configure Syncthing on both Windows and Linux, ensuring your files are always up to date everywhere.

Step 1: Download and Install Syncthing

To get started, download the latest version of Syncthing from the official website. Choose the appropriate installer for your operating system. For Windows, use the executable installer or the portable zip file. For Linux, you can either download the pre-built binary or use your distribution’s package manager. For example, on Ubuntu or Debian, run:

sudo apt install syncthing

On Fedora, use:

sudo dnf install syncthing

After installation, launch Syncthing. On Windows, simply open the application. On Linux, you can start it from the terminal with:

syncthing

Step 2: Initial Configuration

The first time you run Syncthing, it opens a web interface, usually at http://localhost:8384. This is the main dashboard where you manage folders and devices. Syncthing automatically generates a unique Device ID for each computer. To sync files between devices, you must share these IDs and approve each connection, ensuring security.

To connect two devices:

  • On Device A, find its Device ID on the Syncthing dashboard.
  • On Device B, click “Add Remote Device” and enter Device A’s ID.
  • Repeat the process to add Device B’s ID to Device A.
  • Accept the connection prompts on both devices to establish a secure sync relationship.

Step 3: Adding and Syncing Folders

Once devices are connected, you can add folders to synchronize. Click “Add Folder” in the dashboard, specify the local folder path, and assign a Folder ID. Then, share the folder with your remote device by ticking its name under “Sharing.” On the second device, you’ll be prompted to accept the shared folder and select a local path for synchronization.

Syncthing will start synchronizing files automatically whenever changes are detected. All data transfers are encrypted, and you can monitor progress from the dashboard. To avoid conflicts, try to avoid editing the same file on different devices simultaneously.

Step 4: Advanced Options and Best Practices

Syncthing offers a range of advanced settings. You can set synchronization modes (send-only, receive-only, or send-receive), adjust versioning to keep old file copies, and limit bandwidth usage. For better security, consider enabling user authentication for the web interface and restricting access to trusted networks.

To run Syncthing in the background, set it up as a service. On Windows, this can be done with third-party tools like NSSM. On Linux, you can use systemd:

systemctl --user enable syncthing
systemctl --user start syncthing

This ensures Syncthing runs automatically when you log in.

Conclusion

Using Syncthing, you can securely and efficiently keep your files synchronized across Windows and Linux systems without relying on the cloud. With its decentralized approach and robust security, Syncthing is a great choice for privacy-conscious users and teams. Explore the advanced settings to tailor Syncthing to your workflow and enjoy seamless, real-time file synchronization.

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