If I have an iPhone and an iPad can I just back up my iPhone to the cloud

If you only backup the iPhone and the iPad has apps or data that differs from the iPhone, then you risk losing that iPad specific data if the iPad fails, is lost or stolen.

You can backup both devices to your iCloud account.

BobPrestyly Said:

"If I have an iPhone and an iPad can I just back up my iPhone to the cloud"

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Yes. Backing up a device is an option --not a requirement.