Backup SMS

Hi, I am using iPhone 4s with ios 7.1.2. I have to restore my iPhone.So, before restoring, I want to backup SMS text messages from my iPhone. And I want to import these messages to my iPhone again after restoring my iPhone.But I don't know how to backup SMS from iPhone and how to import these SMS to my iPhone. I want to backup my SMS from my iPhone to my computer.I am using Windows 8.1.Please tell me how to do and what applications software I should use if you know.

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