Many place did revert back to paper processes. But, it’s a disaster model that has to tested to make sure everyone can still function when your EMR goes down. Situations like this just reinforce that you can’t plan for if IT systems go down, it is when they go down.
My experience with internet outages affecting retail is the ability to rapidly and accurately calculate bill totals and change is not practiced much anymore. Not helped by things like 9.075 % tax rates to be sure.