pretty much what I was about to say.Hard copy is harder to delete and serves as a backup in the event of data corruption, and sensitive trade secret information can't be hacked. I personally won't rely on digital currency, books, and don't even own a home computer.
There's a well known silver mine at Alva (near Stirling). It's famous because the proceeds from it were used to fund the 1715 Jacobite uprising. A few hundred yards from it is the much older and forgotten Sterling silver mine. It was producing silver during the period Stirling begins to be used as a silver and currency indicator."What's America got to do with the price of cheese?"
@Duck, my error so apologies. I wrongly assumed the silver mine you mentioned was in America.
Whatever, the term sterling does not originate from any silver mine anywhere which was my main point.