How to take iCloud backup in your iTunes?
how to take backup in iTun?
iPhone 6, iOS 12.0.1
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You can’t backup to iCloud using iTunes nor would you need to do so. iCloud backups happen complelety free of iTunes and are done when you are connected to WiFi. They occur automatically when your device is locked, connected to WiFi and plugged in to charge.
This might help you understand the process better.
How to back up your iPhone, iPad, and iPod touch - Apple Support