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rdiff-backupKopia
Free

Free and open source under the GPL.

 Free

Free and open source, with no paid edition.

Windows, macOS, Linux, Command line Windows, 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
  • A desktop app and a command line tool that share the same repository format
  • End-to-end encryption with keys you control, plus compression and deduplication
  • No client-side encryption
  • Restoring very old versions means replaying many increments
  • Backs up the files and folders you choose; it is not a whole-disk imaging tool
  • Still pre-1.0, so repository format changes between versions are possible
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License: Apache-2.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 20, 2026

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