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Microsoft develops ultra durable glass plates that can store several TBs of data for 10000 years
(unlocked.microsoft.com)
This is a most excellent place for technology news and articles.
Why would the average consumer need to store data for 10000 years?
Maybe stop eating bacon and ice cream for every meal and you'll live longer
There can only be one.
Its read only, so it would be like an old CD-ROM, once you write the data can't alter or overwrite it.