Why Don't Have Enough iCloud Storage To Backup My iPhone?

My iPhone 5s has always done a backup but for some reason, I tried to backup the iPhone again this morning and it said that I don't have enough iCloud storage. What do I have to do to get more iCloud storage WITHOUT BUYING MORE STORAGE?

You… Don't. You just choose what you want iCloud to back up so you don't use all of your storage limit.

If you want a full backup then use your PC.

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