The total amount of storage space accessible through iCloud is referred to as iCloud Storage. That’s what you pay for. Your iPhone will cease backing up to iCloud when your iCloud Storage runs out, and you’ll need additional storage space or free up storage space in iCloud in order to continue backing up.

iCloud Drive is a useful service, especially if you’re sticking with Apple’s ecosystem, but it doesn’t compare to Google and Microsoft’s alternatives.

Reduce the size of your iCloud Backup. Remove images from iCloud Photos. Delete files or folders from iCloud Drive. Delete messages and attachments in Messages. Messages will be deleted, as will Mail if you don’t pay for it before July 2019.

After you’ve deleted photos from your iPhone, iPad, or Mac computer or uploaded them to iCloud, the amount of space they take up on your device will decrease. That’s because instead of being permanently erased, photographs and videos are saved in the Recently Deleted album after you trash them.

You won’t be able to send or receive emails after your iCloud storage is full. At the same time, you may notice that past emails saved in the Mail app are using iCloud space for something else. The solution is to go through your email and delete what you don’t need.