Accidents: Any medium or site used to store data is potentially vulnerable to accidents and natural disasters. Maintaining copies of the Archive's collections at multiple sites can help alleviate this risk. Part of the collection is already handled this way, and we are proceeding as quickly as possible to do the same with the rest. Migration: Over time, storage media can degrade to a point where the data becomes permanently irretrievable. Although DLT tape is rated to last 30 years, the industry rule of thumb is to migrate data every 10 years. Given developments in computer hardware, we will likely migrate more often than that. Data formats: As advances are made in software applications, many data formats become obsolete. We will be collecting software and emulators that will aid future researchers, historians, and scholars in their research.