I have always wondered how long it would take humans to devolve if our electronic store of knowledge was suddenly wiped out. Would the darkness be deep as many skills combining mind, hand and back are no longer practiced?
There are always books. But time is the Great Book Burner.
How many ancient scrolls are still around in readable condition today?
A couple of thousand years and all is lost.
Computers fare even worse than books; hardware, operating systems, programming languages, change so quickly and thoroughly any prolonged break in our civilization will leave people who try to figure it all out in the distant future only wishing it were as simple as the Rosetta Stone!