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Tarsnap vs Duplicity: catalog facts
Tarsnap	Duplicity
Paid Prepaid usage billing at $0.25 per GB-month stored and $0.25 per GB transferred, with no…	Free Free and open source under the GPL.
macOS, Linux, Command line	macOS, Linux, Command line
Client-side encryption with keys only you hold Deduplication uploads only changed data	Encrypts and signs everything before it leaves the machine Supports a very wide range of remote storage back ends
Command line only, with no graphical interface No native Windows client, only Cygwin or WSL	Long incremental chains make restores slow and fragile Periodic full backups are needed to keep chains manageable
Downloadable app, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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