Once, while working at a large grocery store, we lost power. The emergency lights came on, but all the cash registers stopped working. One of the managers ran to the back of the store and returned with hand cranks that fit into the side of the cash registers. It was darker, but sales did not stop. The time required to re-train the cashiers was negligible.

This cyber attack will probably result in a doubling down of the same technology that put them into this position. Perhaps, in addition, they should look for a lower tech fall back approach.