Joomla

Joomla is a PHP CMS that puts the emphasis on structured articles, menus, and user groups while remaining flexible enough to run as a broader application builder. It ships with an extension directory covering galleries, forms, SEO, and multilingual content, plus a template system and layered access control that non-technical teams can work with.

It is commonly used for corporate sites, member portals, and multilingual brochures.

Hosting it inside your own perimeter means the content and user data stay there, and a backup is the same database and file copy you already run.