No technology-based equipment works without electrical power. A system failure caused by a power outage can be devastating to your computer systems, resulting in not only physical damage, but possibly the corruption and/or loss of your data. This is why some form of uninterrupted power supply (UPS) with battery support is crucial in protecting your computer and network equipment.
A UPS provides two major functions. It sustains power to your computer and network equipment in the event of a power outage, and it provides some level of power conditioning. The better UPS systems (often to support servers) will provide protection from large and sudden voltage brownouts and spikes. In case of an extended outage, depending on your business requirement, a UPS can initiate an orderly shutdown of your computer equipment or sustain the computer equipment until the backup generators are able to come online.
At the very minimum some form of regulated or conditioned power with battery time extensions should be supplied to all your server computer systems. It is highly recommended that critical network devices such as firewalls, routers and switches. For the highest level of protection and system availability, client workstations should be added to the UPS protection system.