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Tarsnap vs restic: catalog facts
Tarsnap	restic
Paid Prepaid usage billing at $0.25 per GB-month stored and $0.25 per GB transferred, with no…	Free Free and open source, with no paid edition.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Client-side encryption with keys only you hold Deduplication uploads only changed data	One static binary with no server, agent or database to install first Content-defined chunking means daily backups only transfer what changed
Command line only, with no graphical interface No native Windows client, only Cygwin or WSL	Command line only; any graphical interface or scheduling comes from third-party projects Still pre-1.0, so the project does not yet guarantee backward compatibility across major versions
Downloadable app, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: BSD-2-Clause
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 20, 2026

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