How To Clear The Icloud Backup

View and manage iCloud device backups

You can view and manage your iCloud backups from an iPhone, iPad, iPod touch, Mac, or Windows computer.

If you want to customize which apps and data are backed up, see Back up your iPhone, iPad, or iPod touch to iCloud.

WARNING: If you delete the iCloud backup for your iPhone, iPad, or iPod touch, iCloud stops automatically backing up the device.

On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud > Manage Storage > Backups.

You see the devices with iCloud Backup turned on.
To delete a backup, tap the name of a device, then tap Delete Backup.

On your Mac, choose Apple menu > System Preferences, click Apple ID, then click iCloud.
Click Manage, then click Backups on the left. On the right, you see devices with iCloud Backup turned on.
To delete a backup, select a device, then click Delete.

Open iCloud for Windows, then click Storage.
Click Backups on the left. On the right, you see devices with iCloud Backup turned on.
To delete a backup, select a device, then click Delete.

Note: If you turn off iCloud Backup for a device, any backups stored in iCloud are kept for 180 days before being deleted.

You can also use your computer to back up your device. See the Apple Support article How to back up your iPhone, iPad, and iPod touch.

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Source: https://support.apple.com/guide/icloud/view-and-manage-backups-mm122d3ef202/icloud