What are the advantages and disadvantages of choosing dual power supply or diesel generator set?

First, it depends on the nature of the company. How much does the power outage cost the company? Is there sufficient electricity supply in the cities in this area? If the power is tight, can the State Grid guarantee that it must supply you with power? In addition, in some cities, they all have dual power sources for property or office buildings, but they still need to use generator sets for fire fighting. Of course, with the generator set, it is not only a one-time investment, but also a cost for later maintenance. Power generation is definitely more expensive than commercial power, and it also involves the maintenance and maintenance of generator sets. Why is it called a backup generator set? Can stand up after the power failure.