The governing board of any school district may make photographic, microfilm, or electronic copies of any records of the district. The original of any records of which a photographic, microfilm, or electronic copy has been made may be destroyed when provision is made for permanently maintaining the photographic, microfilm or electronic copies in the files of the district, except that no original record that is basic to any required audit shall be destroyed prior to the second July 1st succeeding the completion of the audit.