Connect iPhone to system after installing the iphone backup software. The software will automatically detect it and will show the list of file from the iPhone.
Choose the files you want to take backup and click on export button.
After you click Export button, the under given window will pop up, you can choose either backup to computer or itunes directly.
When backup is finished a window will pop up displaying message as 'export finished' after which you can see it from the location stored in.
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