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BorgBackup vs Kopia: catalog facts
BorgBackup	Kopia
Free Free and open source, with no paid edition.	Free Free and open source, with no paid edition.
Linux, macOS, Command line	Windows, macOS, Linux, Command line
Content-defined chunking that survives files being renamed, moved or shifted around Authenticated AES encryption, so an untrusted backup server only ever sees ciphertext	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
Primarily a Unix tool; on Windows it needs WSL or Cygwin rather than a native build Borg 2 is still in beta, ships breaking changes between betas and should not hold production backups	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: BSD-2-Clause	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 20, 2026

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