The Society of American Archivist defines Archival Media as ‘resistant to deterioration or loss of quality, allowing for a long life expectancy when kept in controlled conditions’.
If we try to apply this definition to the different types of storage media currently used in the motion picture workflow as it is structured today, it is highly unlikely that we will be able to find many media that fit this definition: other than film, that is.
Whether the production in question uses hard drives, CD’s , tapes or DVDs to store their content, there is always the very real probability that a hard drive will crash, that a tape will get scratched, that the format used will be obsolete and render the information unreadable in a few years (even if the information is still intact). What good does it do to have perfectly good information that you cannot access?