Finally the user data backup mechanism has been detailed designed, and three kinds of recovery solutions to typical errors are discussed based on the analysis of problems existing in the VLR database.

最后详细设计了用户数据的备份机制，并针对VLR数据库中存在问题进行分析，提出了三种典型错误恢复解决方案。

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The backup application starts automatically, searching and backing up data without requiring any user interaction.

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