Dragon,
To expand slightly on what Alex and Russ have said, whenever you delete content from a FrameMaker document and save the result, the deleted content is gone. It doesn't matter whether the deleted content is the element hierarchy or text and graphics in the document. A recent backup, whether a version of the file that you explicitly saved or one created by FrameMaker's automatic backup, is
Alex mentioned that a conversion table might help recreate the document's element structure. His comment assumed that a conversion table was used somewhere in the history of this document. Whether or not that is the case, you can create a new conversion table specifically for this document. If you haven't looked at conversion tables yet, a conversion table is a FrameMaker table that describes how to use tagging in an unstructured document to create an equivalent structured document. How successfully it creates the desired structure depends very much on the nature of the tags used in the unstructured document and the desired element structure.
--Lynne