| 摘要 |
A data backup system and a data backup method for backing up data stored in a mobile communication terminal to a backup device via a communication network, capable of optimizing network traffic as well as improving the selectivity of backup data to thereby improve convenience for the user, a mobile communication terminal and a backup device used for the same, and a backup data transmission method. When transmitting user data from a mobile communication terminal as backup data, the user arbitrary selects at least one of a plurality of data selection condition candidates to set the selected one as a data selection condition. Based on the one or more data selection conditions, user data to be backed up are selected from all user data.
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