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

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