[Beltalowda]

You're right that many clay tablets were lost, so if we rely on an even more fragile medium than clay tablets even more will be lost – possibly even all of it.

Long-term digital storage is a somewhat tricky problem since all of our storage media lose their information over time if left lying about (usually on the order of decades) and require quite careful conditions for preservation. This is true in some sense for a lot of historical artefacts ranging from clay tablets to dinosaur bones to vellum, but getting useful information from half a clay tablet is still quite easy, whereas getting useful information from a broken digital media is a very hard – or even impossible – problem even today. In several thousand years your digital medium will need to be in a very good condition or its useless.