Backups
what does iCloud backup actually backup? Is it safe to delete my backup for my phone because it takes up a lot of space?
iPhone 11, iOS 13
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See: What does iCloud back up? - Apple Support
You can delete the backup from iCloud and it won't delete anything from your phone -- but then you won't have the backup if you need it in the event of a problem. You could backup to a computer instead. See: How to back up your iPhone, iPad and iPod touch – Apple Support