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rsync vs csync2: catalog facts
rsync	csync2
Free Free and open source under the GPL.	Free Free and open source.
Windows, macOS, Linux, Command line	Linux, Command line
Transfers only the changed parts of files, so repeat syncs are fast Preserves permissions, links and attributes, which makes it safe for system trees	Synchronizes files across many hosts at once Tracks file state in a database to detect conflicts
No versioning or snapshots on its own; --delete destroys without warning Command-line only, with a long list of subtle flags	Aimed at server clusters, not desktop users Command-line and config file only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.