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Tarsnap vs Duplicacy: catalog facts
Tarsnap	Duplicacy
Paid Prepaid usage billing at $0.25 per GB-month stored and $0.25 per GB transferred, with no…	Freemium The command-line version is free for personal use and its source is published. The…
macOS, Linux, Command line	Windows, macOS, Linux
Client-side encryption with keys only you hold Deduplication uploads only changed data	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
Command line only, with no graphical interface No native Windows client, only Cygwin or WSL	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
Downloadable app, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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