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rdiff-backup vs Back In Time: catalog facts
rdiff-backup	Back In Time
Free Free and open source under the GPL.	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux, Command line	Linux
The newest backup is a plain mirror you can read without the tool Reverse deltas keep history cheap while the current copy stays instant	Unchanged files are hard-linked rather than copied, so each snapshot looks complete while using very little extra disk…
No client-side encryption Restoring very old versions means replaying many increments	It is Linux-only and inherits rsync's weaknesses, including no built-in encryption and slow handling of very large file…
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.