What is a back up?
What is a back up and how it works?
iPhone 7, iOS 13
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An iCloud backup makes a compressed and encrypted copy of the data on your iPhone or iPad so if it ever needs to be restored, you won’t loose your data. It can also be used to set up a new device to be exactly as your old device was. Without a backup, if your device malfunctions, or get accidentally broken, you will lose the data on it.
See -> How to back up your iPhone, iPad, and iPod touch - Apple Support and What does iCloud back up? - Apple Support