Consider bolting your equipment down in some appropriate fashion, and don't forget to fasten your rolling equipment racks down, too. Depending on your industry and location, you may wish to consider what vandalism, looting, revenge, or a disgruntled employee might do to your equipment. One of the most important things, if you have a nontrivial computer room, is to consult a local expert who can advise you on what is the most appropriate protection in your area and for your situation. Just about everyone is in a position to be affected by some form of utility failure, the most obvious being electrical power failure. Even if you generate your own electricity with wind turbines and backup batteries, you're still at risk of extended calm or physical failure of your generating equipment.
Most people can survive short outages on an occasional basis.
Electricity Most of us rely on electricity from the local power company. But it's important to remember that, in a disaster, you won't be worried only about your central computing systems. You'll need power to run heating or cooling equipment, ventilation, at least some room lighting, your telephone switch, and so on. Water From a system administration perspective, the primary use for water is in air conditioning equipment. In some situations, a reservoir or cistern could provide spare water during an outage, and water tanker trucks are sometimes available.