Patent ID: 7941128

Claim:
A data backup system comprising: a mobile device; a data storing apparatus configured to store user backup data uploaded from the mobile device; and a user management apparatus configured to manage user information of a user of the mobile device, the mobile device, the data storing apparatus, and the user management apparatus being capable of mutually communicating with each other; wherein the user management apparatus is further configured to store new device ID information of the mobile device, in association with user identification information of the user and old device ID information of a previously used old mobile device, when the mobile device is a replacement for the old mobile device, wherein the mobile device is configured to create and transmit a user data acquiring request message with an old device user data acquiring request flag activated when downloading user data previously used in the old mobile device, the user data acquiring request message including new device ID information of the mobile device, and wherein the data storing apparatus is configured to verify identification of the user using the new device ID information included in the user data acquiring request message with respect to the user management apparatus when the flag is set in the user data acquiring request message, retrieve the user data used in the old mobile device if the identification of the user is verified, based on the old device ID information received from the user management apparatus, and transmit the retrieved user data to the mobile device.