I have my iCloud backups stripped down to only CONTACTS and NOTES and about 150MB of apps, yet the backup is 5.22 GB.
How do I make my iPhone backup smaller?!
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To figure out what exactly gets backed up (or what iOS wants to backup):
This gives you a list of all things iOS wants to backup, including their size. It also gives you the option to enable/disable which application data gets backed up.
You can purchase more storage for just one month and back up your phone to be sure it works ok. If your iphone backup runs to completion then you can check the actual size of the backup. If it is indeed too large to copy to you lower icloud storage, you can try making room or keep your extra storage. If you can fix your problem then be sure to lower your storage option. This way will cost you 99 cents I believe.
I created an account just to answer this question. I ran into this issue myself months ago and was unable to find an answer. The short of it is, Apple is backing up things even if you have them disabled. In my case, Messages was completely disabled from iCloud backup. In fact, almost everything was but my initial backups kept saying 4.4GB or so. I looked at my storage and noticed the closest to that were my Messages. So as a test I deleted a top conversation that was over 1GB and when I recalculated my iCloud backups, sure enough it dropped by a gig.
So great job to Apple backing up something I explicitly disabled. Thankfully I resolved this issue on my own doing testing. I hope this helps others.
As seen from the photos, your large backup was 5.22 GB which is a significant amount. I see you have disabled some options, so the backup sie is now 188.4 MB.
Now you have two options:
If you want to keep your old backup you need to buy more storage to backup again. To buy more storage click the Upgrade button.
To free up space you can delete your old large backups. On the iCloud storage screen, go to Manage Storage and then Backups. Here you can delete Backups for a specific device.
To fix the large backup issue:
Delete all backups, log out of iCloud, log back in and do a fresh backup. That always works.