iCloud User Guide
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Remove a device backup from iCloud
You can free up iCloud storage space by deleting the entire iCloud backup for an iOS or iPadOS device, such as a device you no longer own. If you are restoring a device from an iCloud backup, you must wait until the restore process is finished before you can delete the backup.
WARNING: If you delete the iCloud backup for your iOS or iPadOS device, iCloud stops automatically backing up the device.
Instead of backing up your iOS or iPadOS device to iCloud, you can back up your device using your computer. See the Apple Support article About backups for iPhone, iPad and iPod touch.
Remove a backup using your iPhone, iPad or iPod touch
On your iOS or iPadOS device, go to Settings > [your name] > iCloud > Manage Storage > Backups.
Tap the name of a device whose backup you do not need, then tap Delete Backup.
Remove a backup using your Mac
On your Mac, choose Apple menu
> System Preferences, then do one of the following:
macOS 10.15 or later: click Apple ID, click iCloud, then click Manage.
macOS 10.14 or earlier: click iCloud, then click Manage.
Click Backups on the left, select an iOS or iPadOS device on the right whose backup you do not need, then click Delete.
If you do not see Backups on the left, your iOS or iPadOS devices do not have any iCloud backups. See Back up your iPhone, iPad or iPod touch to iCloud.
Remove a backup using your Windows computer
Open the iCloud for Windows app, then click Storage.
Click Backups on the left, select an iOS or iPadOS device on the right whose backup you do not need, then click Delete.
If you do not see Backups on the left, your iOS or iPadOS devices do not have any iCloud backups. See Back up your iPhone, iPad or iPod touch to iCloud.