I actually have two generators. A big one at home which I could bring into the office and a portable one (which I use while camping) which I could bring in and use long enough to at least get the daily schedules. Living on a farm, we also buy gas and diesel in bulk so I figure I could run for a while. We lose power in the office for a few hours at as time fairly often (the squirrels seem to like running about the transformer) and I just make do. I presume that, in the event of a major catastrophe there would be few patients needing to be seen for follow up problems...they will be consumed by their own outages. Injuries and acute illness I could do without my charts.