That's something that concerns me a lot. A lot of what we know about our history came from analog media that was preserved throughout history. Will future generations (100, 200, 1000 years from now...) be able to access our digital documents to understand how we lived?
Edit: the scenario I proposed in the title was just a way to express my concerns more concisely. I don't think it will actually happen but answering it is equivalent to addressing my concerns..