To efficiently manage the volume of records generated and received, the Clerk of the Board must dispose of unnecessary records and documents that have no apparent historical significance or further administrative value, are not required to be maintained by state or federal law, and are no longer necessary for their purposes pursuant to Government Code section 26202. Government Code section 26202 allows the Board of Supervisors to authorize the destruction of any record more than two years old without being photographed microfilmed or otherwise reproduced if it is not required by state statute or county charter to be prepared or received, or if it is prepared or received pursuant to state statute or county charter but it is not expressly required by law to be filed or preserved.