UPS is an abbreviation for Uninterruptible Power Supply or Uninterruptible Power Source. That is a battery used to power your personal computer or a hosting server to prevent the loss of data when the main source of energy fails for whatever reason or becomes risky. A diesel generator basically self-explanatory. UPSs and generators are used as a backup in data centers to back up the main power source and to ensure the continuous running of all the machines located there. Because the UPS operates at all times, it offers the desired power for the machines to remain operational until the generator starts and takes over. Using this type of a backup is critical for any data center or service provider that wants to keep their hardware and data intact in case there is a power surge or outage, since it gives them ample time to react until the issue is resolved and the main power supply is restored.