A data processing method, comprising: receiving a data acquisition request sent by a terminal; on the basis of the data acquisition request, determining a backup data set from amongst backup data in a target cloud account, and sending to the terminal part of the backup data in the backup data set; receiving authentication information sent by the terminal and verifying the authentication information; and if verification is successful, then sending to the terminal the remaining unsent backup data in the backup data set. Also provided in the present invention are a data processing apparatus, a storage medium, a server, and a data processing system.