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Duplicacy vs Kopia: catalog facts
Duplicacy	Kopia
Freemium The command-line version is free for personal use and its source is published. The…	Free Free and open source, with no paid edition.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Several machines can back up to one bucket and share deduplicated data with no server between them Chunks are stored individually, so any storage with basic file operations works as a backend	A desktop app and a command line tool that share the same repository format End-to-end encryption with keys you control, plus compression and deduplication
Licence is not open source; commercial use and the web interface are paid The free part is a command-line tool, so the friendly front end is the paid one	Backs up the files and folders you choose; it is not a whole-disk imaging tool Still pre-1.0, so repository format changes between versions are possible
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

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