The invention provides a distributed data backup method. The method comprises the following steps: a dispatching server obtains configuration information of a server cluster; the dispatching server obtains a server list required to be backup according to the configuration information, and generates backup tasks according to the server list required to be backup and dispatches the backup tasks to at least one backup server; the backup server which receives the backup tasks turns on a data transmission port of a server specified in the backup tasks, and receives and saves backup data transmitted by the specified server. By adopting the method, the security of the backup data can be improved. In addition, the invention further provides a distributed data backup system.