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Duplicacy vs bup: catalog facts
Duplicacy	bup
Freemium The command-line version is free for personal use and its source is published. The…	Free Free and open source.
Windows, macOS, Linux	macOS, Linux, Command line
Several machines can back up to one bucket and share deduplicated data with no server between them Chunks are stored individually, so any storage with basic file operations works as a backend	Global deduplication across and within files Fast incremental saves
Licence is not open source; commercial use and the web interface are paid The free part is a command-line tool, so the friendly front end is the paid one	Command line only Development discussion happens on a mailing list rather than GitHub issues
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: LGPL-2.1
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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