I have my great grandmother and her mother on glass. It's as good as the day it was made. Modern life however, does not lend itself to caring for these things.
The Texas house is too expencive to cool while we're away for months on end. Everything goes up to at least 90f - and stays around there, night and day.
I had a professional company copy The Making of Bartoli's Vivaldi. Sooooo much better than the CD when I got it. However, after about 2 years max, one of the most beautiful parts was lost. It just couldn't have been a worst place to fail, but fail it did.
It was put onto pro tape, and I'm hoping that's still somewhere in his archives.