Apple Inc has begun keeping the personal data of some Chinese users on servers in mainland China, marking the first time that the tech giant is storing user data on Chinese soil. The data will be kept on servers provided by China Telecom Corp Ltd, the country’s third-largest wireless carrier, Apple said in a statement on Friday. Apple attributed the move to an effort to improve the speed and reliability of its iCloud service, which lets users store pictures, e-mail and other data.