Unable to perform iCloud backup on iPhone
I cannot do any backup at all.
[Re-Titled by Moderator]
Original Title: icloud backup
Question marked as
iCloud Backup is at Settings>[name]>iCloud>iCloud Backup
How to back up your iPhone or iPad with iCloud - Apple Support
What happens when you try? What iPhone do you have? What iOS are you using?
Have you turned on iCloud Photos? Have you turned on Optimize Storage?