2-9 Media Protection Media protection guidelines are as follows: Protect (i.e., physically control and securely store) system media containing Postal Service information, both paper and digital. Limit access to Postal Service information on system media to authorized users. Sanitize or destroy system media containing Postal Service information before disposal or release for reuse. Mark media with prescribed Postal Service information markings and distribution limitations based on the classification level of the data contained thereon. Control access to media containing Postal Service information and maintain accountability for media during transport outside of controlled areas. Implement cryptographic mechanisms to protect the confidentiality of information stored on digital media during transport outside of controlled areas unless otherwise protected by alternative physical safeguards. Control the use of removable media on system components. Prohibit the use of portable storage devices when such devices have no identifiable owner. Protect the confidentiality of backup Postal Service information at storage locations.