Digital Movie: How to archive for the future?

This part of Bordwell series of articles is about the digitization of the archival film, the storage of film for longer periods - "Of all the movies of the silent era have estimated that only 10% survived." Bordwell explains the differences between in preservation, conservation and restoration of analog film and describes the problems incurred by filing the complete digitization of film. How will the future be possible to reconstruct the history of film? How is permanently archived digitally? Who keeps the source material, the digital master? "The future for digital storage is constant migration": the hardware (hard drives) are limited only permanently reliable and also to change the current playable formats and play them back for