Archiving of EMB materials is important to protect the institutional history and memory of an EMB, and to ensure that reference materials are available when required. Archiving policies need to include requirements for document security, for the structure and locations of current hard-copy and electronic file records (including electronic file back-up policies), for the preservation of historical records on or off site, and for the timing and manner of disposal of records that are no longer required. Clear archiving, disposal and/or destruction plans for all EMB equipment and materials are necessary, and are especially important to ensure that electoral materials that could be used in future legal proceedings or for research to improve electoral processes are appropriately preserved. Environmentally sound methods of disposing of unwanted assets — for example, the packaging for used registration kits in Cambodia in 1998 — are a good practice.