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Duplicati vs Kopia: catalog facts
Duplicati	Kopia
Free The backup client is free and open source. The vendor sells a separate commercial…	Free Free and open source, with no paid edition.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
A very long list of supported destinations, including most mainstream cloud storage AES-256 or GnuPG encryption applied before anything is uploaded	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
The stable and canary channels move at very different speeds, and the project spent years in beta Restores of very large backup sets can be slow, because the format is built around remote storage rather…	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
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 20, 2026

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