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rustic vs bup: catalog facts
rustic	bup
Free The open-source application is available without a license fee.	Free Free and open source.
Windows, macOS, Linux	macOS, Linux, Command line
Uses the established restic repository format	Global deduplication across and within files Fast incremental saves
It is younger than restic and compatibility should be checked for your workflow.	Command line only Development discussion happens on a mailing list rather than GitHub issues
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: LGPL-2.1
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 23, 2026

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