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Kopiardiff-backup
Free

Free and open source, with no paid edition.

 Free

Free and open source under the GPL.

Windows, macOS, Linux, Command line Windows, macOS, Linux, Command line
  • 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
  • The newest backup is a plain mirror you can read without the tool
  • Reverse deltas keep history cheap while the current copy stays instant
  • 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
  • No client-side encryption
  • Restoring very old versions means replaying many increments
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-2.0
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 20, 2026

Checked September 22, 2026

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