How to Backup via iTune File Sharing to your computer:
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Select “Backup & Restore”. Go to “iTune File Sharing” section, Press “+” to create new Backup file (ex. Call_Backup_20161231_235959.sqlite).
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Connect iPhone to your computer via USB cable.
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Open iTune in your computer, then select your iPhone and select this app in the list in the file sharing section..
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Select the file in step 1 from the Documents list and copy the backup file to your computer.