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Backdrop CMS vs Joomla!: catalog facts
Backdrop CMS	Joomla!
Free Free and open source under the GPL-2.0 licence.	Free Free and open source under the GPL-2.0 or later license.
Web, Self-hosted	Self-hosted
Built-in upgrade path from Drupal 7 Add-ons install from inside the site	Built-in multilingual support Multi-user permission levels
Requires PHP and MySQL hosting Add-on selection is narrower than larger CMS ecosystems	Requires a PHP and database server Administration can feel complex for small sites
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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