Data stored in electronic computers risks being lost if it is not frequently migrated into more recent file formats. This happens because as new computer systems are developed and new technologies are built, now obsolete systems may break down over time, leaving the data inside inaccessible. Electronic data preservation is further complicated by the fact that unless an emulator for a given computer system which can decode the data is present at the time of the preservation, the original data may become inaccessible as the original hardware breaks down, as it may depend on the original hardware to be decoded, although in some cases the original data may be recoverable through lengthy reverse engineering work with the objective of understanding the original computer system enough to decode the most original electronic data possible.
