rsync

What is rsync?

rsync has been a core Linux tool since the late 1990s, known for its efficient delta-sync algorithm that transfers only changed parts of files. It's mature, stable, and included by default in most distributions. Its reliability and network efficiency have made it a standard in system administration and backup workflows.

It's best for users comfortable with the terminal, including system admins, developers, and Linux-savvy users who need precise control over file transfers. While it lacks a GUI, its scripting capability makes it ideal for automation. Not aimed at casual users who prefer point-and-click.

Compared to Resilio Sync, rsync is not peer-to-peer and doesn’t sync in real time. It requires manual or scripted execution, not continuous background syncing. However, it’s more predictable and transparent, especially over SSH. It feels less 'automatic' but far more controllable and secure when used correctly.

Best for: Automating secure, efficient file synchronization between trusted systems.

Key features of rsync

• Efficient delta syncing reduces bandwidth use
• Supports local and remote transfers over SSH
• Preserves permissions, symlinks, and timestamps
• Can resume interrupted transfers
• Filter rules for include/exclude patterns
• Scriptable and ideal for cron automation
• Works over any shell-accessible connection

Tips for Windows users

Unlike Resilio Sync, rsync doesn’t run as a background service by default. You’ll need to run it manually or via cron. It doesn’t use a proprietary file format — just regular files and directories. Use SSH keys for passwordless auth. Replace Resilio’s automatic sync with scripts calling rsync with --archive and --delete flags as needed.