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Duplicity vs Kopia: catalog facts
Duplicity	Kopia
Free Free and open source under the GPL.	Free Free and open source, with no paid edition.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Encrypts and signs everything before it leaves the machine Supports a very wide range of remote storage back ends	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
Long incremental chains make restores slow and fragile Periodic full backups are needed to keep chains manageable	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: GPL-2.0	License: Apache-2.0
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 20, 2026

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