The UPS and the diesel generator are two devices for keeping a web server functioning in case there are problems with the primary power supply - a disruption or shaky current that cannot keep the machine working correctly, for example. UPS is an abbreviation for Uninterruptible Power Supply, even though it is frequently called Uninterruptible Power Source as well. The UPS is, in simple terms, a highly effective battery that is attached to the machine and to the power network consistently, so if there is any blackout, it is already functioning, which allows the server to keep on doing the job without losing any info. The diesel generator is an engine which can power up the entire data center. It does take some time to start working and it's the UPS which provides that time. These 2 power solutions are a necessity for any facility or service provider that wants to avoid information loss and hardware damage caused by an unexpected power issue.