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