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Unpowered SSD endurance investigation finds severe data loss and performance issues
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
I did call out data density in my first comment. Did you somehow miss that? Not all things that need storing are megabytes in size, though.
Why would you assume that paper means punch cards? Printers can store far more than a machine word on a page, are relatively cheap, and are widely available. For some things, this can be superior to both magnetic and flash storage.
Not to mention PaperBack, it's essentially making a backup for life.