The UPS and the diesel generator are 2 instruments for keeping a web server functioning in case there are troubles with the main power source - an outage or shaky current that cannot keep the machine functional, for example. UPS is an abbreviation for Uninterruptible Power Supply, though it is oftentimes called Uninterruptible Power Source as well. The UPS is, basically, an effective battery which is attached to the machine and to the power network consistently, so in case there is any disruption, it is already functioning, which allows the server to continue doing the job without losing any info. The diesel generator is an engine that will power up the entire data center. It does take some time to begin working and it's the UPS which gives it this time. Those 2 power solutions are a necessity for any facility or hosting company that wants to prevent info loss and hardware damage as a result of an unexpected electric power issue.