Actually the 'Data' folder does contain mesh data.  Care must be taken to not lose or erase any data content.   If data is lost, 'Scene' files will not show any objects.   The data can be rebuilt by creating a new scene with all the models you used in the original plus any morphs used.  The models don't have to be posed or position.  Saving the new scene should put the mesh data you need back in 'Data' folder.