from Scientific American -
Artists ponder future of digital Mona Lisa
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Saving what is essentially impermanent, though seemingly foolhardy, may not be impossible, if there is a concerted effort and strategy. Media and content migration are 2 such well-established approaches. Another, which might be more a shift in mind-set than technological, is that:

"... art lovers should consider digital art more like Beethoven's Fifth Symphony, something to be revisited periodically and brought back to life through different performances."

In final analysis, heritage and cultural preservation, in all its various guises, can only be as effective as the collective drive to value what is being preserved.