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Back In Time vs Kopia: catalog facts
Back In Time	Kopia
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source, with no paid edition.
Linux	Windows, macOS, Linux, Command line
Unchanged files are hard-linked rather than copied, so each snapshot looks complete while using very little extra disk…	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
It is Linux-only and inherits rsync's weaknesses, including no built-in encryption and slow handling of very large file…	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
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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