Salutations Auryn360,
It sounds like with all the things iCloud backs up, plus the data syncing with iCloud it is more than 5 GB. You can check the next backup size though, to see how much space is needed. However, you also don’t have to use iCloud backups if you prefer to backup via another method.
If an alert says that there's not enough iCloud storage
1. In iOS or iPadOS, go to Settings > [your name].
2. Tap iCloud. At the top, you can check how much iCloud storage you've used.
3. Tap Manage Account Storage or Manage Storage.
4. Tap Backups, then tap the device you're using. Under Last Backup and Backup Size, you can check Next Backup Size. It may take a few minutes for your device to calculate Next Backup Size.
5. If your backup needs more space than the amount you have available in iCloud, you can:
• Delete information that you don't need to reduce the size of your backup
• Upgrade your iCloud+ plan to get more space
To turn off iCloud backups, so they are not being attempted any longer and therefore not showing an error, you’ll do that in Settings > [your name] > iCloud > iCloud Backup. Be sure to make backups to a computer in that case. Here's how - How to back up your iPhone, iPad, and iPod touch
Thanks.