What does a server primarily do to process data?

A server plays a crucial role in processing data, and its primary function is to execute queries for data manipulation. This involves performing operations such as retrieving, updating, inserting, and deleting data within a database. When clients make requests—typically through applications or web services—the server uses queries to interact with the data, ensuring the data is managed and accessed as needed.

The other functions, while important aspects of data management, do not represent the primary purpose of a server in the context of data processing. Storing data securely, encrypting sensitive information, and backing up data automatically are all essential tasks that support data management and security, but they do not directly involve the active processing of queries. Instead, they complement the server's role by enhancing data security, ensuring data availability, and protecting against data loss. The execution of queries remains the central function in the processing of data, making it the most appropriate answer in this context.