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Duplicacy vs Arq: catalog facts
Duplicacy	Arq
Freemium The command-line version is free for personal use and its source is published. The…	Paid Paid software with a 30-day free trial.
Windows, macOS, Linux	Windows, macOS
Several machines can back up to one bucket and share deduplicated data with no server between them Chunks are stored individually, so any storage with basic file operations works as a backend	Back up to your own cloud storage or local disk End-to-end encryption
Licence is not open source; commercial use and the web interface are paid The free part is a command-line tool, so the friendly front end is the paid one	No Linux version Cloud storage is billed separately by your provider
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 21, 2026	Official website Full listing and sources Checked September 23, 2026

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