How do I delete iCloud back ups?

👉 Choose which apps to back up on your iPhone, iPad, or iPod touch

1. Go to Settings > [your name] > iCloud.
2. Tap Manage Storage > Backups.
3. Tap the name of the device that you're using.
4. Turn off any apps that you don't want to back up.
5. Choose Turn Off & Delete.

When you confirm that you want to Turn Off & Delete an app, it turns off iCloud Backup for that app and removes all of its information from iCloud.

Some apps are always backed up and you can't turn them off.

👉 Delete backups and turn off iCloud Backup for your device

You can delete old iCloud backups for the device you're currently using, or older devices you may not use anymore. iCloud backups are available for 180 days after you disable or stop using iCloud Backup. Backups that are currently being used to restore a device can't be deleted.

👉 iPhone, iPad, and iPod touch

1. Go to Settings > [your name], then tap iCloud.
2. Tap Manage Storage > Backups. 
3. Tap the name of the device whose backup you'd like to delete. 
4. Tap Delete Backup > Turn Off & Delete.

When you delete a backup, it also turns off iCloud Backup for your iPhone, iPad, or iPod touch. You can turn iCloud Backup back on in iCloud settings on your device. 

See -> Manage your iCloud storage

Manage your iCloud storage - Apple Support