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rdiff-backup vs Duplicity: catalog facts
rdiff-backup	Duplicity
Free Free and open source under the GPL.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
The newest backup is a plain mirror you can read without the tool Reverse deltas keep history cheap while the current copy stays instant	Encrypts and signs everything before it leaves the machine Supports a very wide range of remote storage back ends
No client-side encryption Restoring very old versions means replaying many increments	Long incremental chains make restores slow and fragile Periodic full backups are needed to keep chains manageable
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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