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rsync vs osync: catalog facts
rsync	osync
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	Bidirectional sync on top of standard rsync Fault tolerance and POSIX ACL support
No versioning or snapshots on its own; --delete destroys without warning Command-line only, with a long list of subtle flags	Command-line only, configured through files Needs rsync and a Unix-like shell environment
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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