How to Delete Backups on WhatsApp on iPhone or iPad

Open your iPhone or iPad's Settings. It's the gray gear icon typically found on the home screen.

Tap your Apple ID. If you're using iOS 10.3 or later, you'll see it at the top of the screen. If you're using an earlier version of iOS, you can skip this step.

Scroll down and tap iCloud.

Tap Storage.

Tap Manage Storage.

Tap WhatsApp. Look for the white phone receiver in a green chat bubble.

Tap Edit. It's at the top-right corner of the screen.

Tap Delete All. All of your backed-up WhatsApp data will now be removed from iCloud.