Layout data for Page Builder is stored in the WordPress postmeta table in a serialized array.
Live Page Builder data is stored using the postmeta key
_fl_builder_data, , 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 Page 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 the builder.