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Digital records do disappear and it's a serious problem, because we produce so much of them, and they fade so quickly, that there isn't enough manpower to actively preserve them.
It's so bad that people experience data loss in their lifetime. Case in point, I had backed up photos of my late grandfather, and wav records of his voice in the mid 90s on a CD, and I thought I had copies on the hard-drives that I regularly refresh, but I didn't. I found that CD: it is now yellow, delaminated, brittle and unreadable. When I realized I didn't have any other backup, it came as a bit of a shock, as I realized the only images of my grandfather I'll ever see again are in my head, and I'll never hear his voice again.
Note that it's not just digital media: early movies, shot on celluloid film, are quickly disappearing too because the films themselves are disintegrating. So are argentic photos and - guess what - books and newspapers printed on acidic paper, which are the overwhelming majority of books out there. Yes, regular books start to yellow within 50 years, and are pretty much unrecoverable and lost after 100 to 150 years, even if they're stored carefully. Keeping them longer requires special archival-grade, acid-free paper.
So, the sad fact is, our society, with all its powers and riches, will leave fewer traces of itself for future historians than earlier ones that used clay tablets, cave paintings and earthenware frescoes to express themselves. In a thousand years, I believe the only testimonies of our civilization will be a bunch of slowly decaying radioactive storage sites, and whatever didn't turn back to dust in our dump pits, like glass. But whatever literary, visual or musical art we'll have produced will be long gone and forgotten.
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