I remember a story of a computer data center that successfully went to generator backup, only to have the generator fail within 10 minutes of the switchover. When power was restored the supreme potentate of the data center was furious. Hadn't the backup been tested? Absolutely it had been tested. They'd faithfully tested that generator every month for three years. Then how did it fail? It ran out of fuel. It seems that nobody bothered to check the level after each of those faithful tests, and the tests ran it down to where it only had ten minutes' worth of fuel left.
This was back in the day when a Commodore 64 cost $10,000.
*choke* It would have been too bulky to take with us, anyway, and the WWW was only in its infancy.