(bei Amazon) von Steven G. Krantz lesen wir auf Seite 99 im Abschnitt „Publishing Papers“:
Hard-copy journals and books are archived by putting a thousand copies in a thousand different libraries around the world. Each copy is stable, and the likelihood of all copies disappearing is slight. Electronic media can also have mirror copies, backup copies, disaster backups, and so forth. But each copy is unstable, and sunspots or other natural disasters could wipe out all copies at once. There is still much to learn about the archiving of electronic media.