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Microsoft develops ultra durable glass plates that can store several TBs of data for 10000 years
(unlocked.microsoft.com)
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Very good explanation. Thanks for that.
Also, with any storage system, it's not "store it and forget it". With something like this you'd store, then do testing in determined intervals, to ensure it's still retrievable.
You'd also do replication and duplication. I.e. replicate the data on disparate and different media, with each location performing duplication onto new media as part of the ongoing testing/validation process, eventually leading to longer and longer intervals for testing/duplication.