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Kopia vs Arq: catalog facts
Kopia	Arq
Free Free and open source, with no paid edition.	Paid Paid software with a 30-day free trial.
Windows, macOS, Linux, Command line	Windows, macOS
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	Back up to your own cloud storage or local disk End-to-end encryption
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	No Linux version Cloud storage is billed separately by your provider
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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