The UPS and the diesel generator are two devices for keeping a web server functional if there are difficulties with the main source - a disruption or unreliable current that cannot keep the machine functioning properly, for instance. UPS is an abbreviation for Uninterruptible Power Supply, even though it is sometimes called Uninterruptible Power Source as well. The UPS is, basically, an effective battery that is attached to the hosting server and to the electricity network constantly, so in case of any disturbance, it's already operating, which allows the hosting server to keep on operating without losing any information. The diesel generator is an engine that will power up the entire data center. It needs some time to start working and it's the UPS which gives it this time. These 2 power solutions are absolutely essential for any facility or service provider that wants to prevent data loss and hardware damage as a consequence of an unexpected electrical power problem.