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Kopia vs Duplicity: catalog facts
Kopia	Duplicity
Free Free and open source, with no paid edition.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
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	Encrypts and signs everything before it leaves the machine Supports a very wide range of remote storage back ends
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	Long incremental chains make restores slow and fragile Periodic full backups are needed to keep chains manageable
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 22, 2026

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