Embodiments of the present disclosure relate to a method for data backup. The method includes obtaining an attribute value associated with a backup task to be run, the backup task being used for backing up data on a client terminal to a server through a network, the attribute value including a value of at least one of an attribute of the client terminal, an attribute of the server, and an attribute of the network; determining, based on the attribute value, the number of threads to be used to perform the backup task on the client terminal; and causing the client terminal to perform the backup task using the number of threads to back up the data.