Over the years, agencies have moved away from paper records to electronic records. The scope of what is included in the phrase “electronic records” can be enormous, encompassing voice mail, email, deleted e-mail, data files, program files, back-up files, archival tapes, temporary files, system history files, web site information in textual, graphical, or audio format, web site file, cache files, “cookies”, and other electronically stored information. Searching for deleted electronic records can be time-consuming and costly, given the number of storage locations that must be checked.