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rdiff-backup vs Disk ARchive (dar): catalog facts
rdiff-backup	Disk ARchive (dar)
Free Free and open source under the GPL.	Free Free; source code and static binaries are published.
Windows, macOS, Linux, Command line	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	Differential and incremental backups alongside full archives Built-in compression and encryption
No client-side encryption Restoring very old versions means replaying many increments	Command line only Several parallel branches can make choosing a version confusing
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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