The embodiment of the invention discloses a configuration data backspacing method, a related device and a related system. According to the invention, a network management system can be backspaced to the configuration data of session of any time and allows the configuration data to be returned to any historical state. The method comprises the following steps: in the process of building a current session at the equipment at the management terminal, downloading configuration data based on the current session to equipment at an agent side; activating the configuration data based on the current session; receiving a user-appointed recovery point to which the data is returned, wherein the recovery point is a mirror image of the configuration data at a certain historical time; and backspacing to the configuration data corresponding to the appointed recovery point according to the user-appointed recovery point.