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bup vs Disk ARchive (dar): catalog facts
bup	Disk ARchive (dar)
Free Free and open source.	Free Free; source code and static binaries are published.
macOS, Linux, Command line	Linux, Command line
Global deduplication across and within files Fast incremental saves	Differential and incremental backups alongside full archives Built-in compression and encryption
Command line only Development discussion happens on a mailing list rather than GitHub issues	Command line only Several parallel branches can make choosing a version confusing
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-2.1	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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