Export All Fields Function?

I am wondering if there is an easy way to export all fields for a folder of files. As an example, when buying digital copies of files I rename them and remove a number of fields, but I would like to keep a copy of all the original fields for reference. However with the current export function, you have to identify the individual fields you want to export. Since the fields are not consistent among different albums, this would take a long time to adjust for each album.

Is there a way to export all the fields without having to specify them individually for each file/folder?