Backdrop shares much of the deep integration with CiviCRM that Drupal 7 offers. This includes the ability to create dynamic views of CiviCRM content (e.g. filterable directories of contact info), the ability to sync membership status to a Backdrop role (e.g. members only content), and the power that Webform CiviCRM provides (e.g. forms that push and pull data from your contact database). That said, some of CiviCRM’s core functionality is still a few steps removed. Contribution pages still don’t play perfectly nicely with custom URLs when dealing with menus and blocks, for example, and event pages aren’t well integrated into the main Backdrop site.
We’re developing a few new CiviCRM-related modules for Backdrop CMS to help soften some of the edges between the systems. The modules will allow you to add CiviCRM pages (e.g. Contribution pages or Event registration pages) into blocks and fields. Here’s an early overview, with some benefits in point form below.