Keeping files in sync across multiple machines is a common task for Linux users. You might use both a laptop and a desktop, manage a home server and a VPS, or just need an extra copy of your important files.
For simple backups, tools like rsync and scp work well, but if you make changes on both systems, one-way sync isn’t enough and you risk overwriting files or losing updates.
This is where Unison File Synchronizer is useful, which is a two-way synchronization tool that compares directories on both sides, detects changes, and updates them so that both locations always stay consistent.
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