Apparatus and method for contents back-up in home network system

The present invention automatically saves content generated by a mobile terminal or a camera in a home gateway in a home network system. In addition, when the home device is synchronized with the home gateway, the present invention can transmit data backed-up in the home gateway to the synchronized device. The present invention can classify and save the data selectively using a special position, a location, a memo, a voice, etc. set by the user to protect privacy when saving the data.