The UPS and the diesel generator are two instruments for keeping a web server working in case there are issues with the main power source - an interruption or shaky current that cannot keep the machine functioning properly, for example. UPS is an abbreviation for Uninterruptible Power Supply, though it is oftentimes called Uninterruptible Power Source also. The UPS is, in simple terms, an effective battery that's attached to the web server and to the power network consistently, so in the event of any disruption, it's already functioning, that permits the web server to carry on working without losing any data. The diesel generator is an engine that will power up a whole data center. It needs some time to start working and it's the UPS that gives it this time. Those 2 power solutions are a requirement for any facility or service provider that wants to avoid info loss and hardware damage caused by an unexpected power problem.