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Kopia vs Backrest: catalog facts
Kopia	Backrest
Free Free and open source, with no paid edition.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Self-hosted
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	Browse snapshots and schedule maintenance in one interface
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	Depends on restic and requires backup storage.
Downloadable app	Self-hosted
Open source	Open source
License: Apache-2.0	License: GPL-3.0
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.