Bloomberg — China’s latest Covid lockdown has virtually paralyzed a city of 6 million that houses much of the country’s electronic information, forcing Apple Inc. ’s datacenter operator to take emergency measures to shut out the pandemic. Apple’s partner in Guiyang, which operates the server center that houses all online data generated and stored by hundreds of millions of Chinese iPhone users, described what amounted to a “ closed loop ” system under which employees are barred from leaving the premises. Many haven’t seen their families for a week, Guizhou Cloud Big Data, Apple’s government-backed partner, said in a WeChat…