Layout data for Beaver Builder is stored in the WordPress postmeta table in a serialized array.
Live Beaver Builder data is stored using the postmeta key
while draft data is stored using the postmeta key
When you activate Beaver Builder, any content that is already in the WordPress editor is migrated to a text module within Beaver Builder. In addition, every time you make changes and publish a Beaver Builder layout, a stripped-down version of the layout is saved to the WordPress editor so your content is available should you ever decide to deactivate Beaver Builder.