UPS is an abbreviation for Uninterruptible Power Supply or Uninterruptible Power Source. That is a battery which is used to power some type of computer or a web server to prevent the loss of info in case the main source of energy fails for some reason or becomes unstable. A diesel generator practically self-explanatory. UPSs and generators are used as a backup in data centers to back up the power and to ensure the constant operation of all the servers located there. Due to the fact that the UPS runs constantly, it provides the necessary power for the web servers to remain functioning until the generator starts and takes over. Using this type of a backup is crucial for any data center or provider that wants to keep their hardware and information intact in the event of a power surge or outage, due to the fact that it offers them ample time to react until the issue is resolved and the main power supply is restored.