On Wed, 26 Jul 2017 21:28:34 -0700 (PDT), trader_4
wrote:

I see no reason to think that if you came across a DVD 100 years from now that there would be no way to get what's there off.

Where would you find a 12" optical drive right now?
That was sold as archival storage just 20-25 years ago.
You would have a hard enough time finding a PC with a 5.25" diskette
drive. I have some IBM 3363 optical disks and I bet there are not 10
running drives in the whole country.
I agree you can copy to new media without losing anything but you
better do it pretty fast while the old drives are still around.