I have CDs and DVDs and HDs that are no longer readable, and books from the 1880s that are just fine. Until we find a truly inexpensive non-volatile medium continuous backup and re-recording will be required for all this digital media. No problem for companies, governments, banks, and other live and active users, but what will happen to archives that are no longer actively maintained?
Some of the oldest books have survived 500 years, the oldest photos have survived since the beginning of photography. What will happen to the photos of my cats in 500 years? I am really worried.