iCloud Backup is getting failed.

comdini Said:

"Cloud Backup is getting failed.: I'm using iPhone 11 Pro with iOS 17. Already I've subscribed 50GB space from iCloud & it's having around 45GB space. but when I run 'Back up now' in phone, it's getting failed due to the insufficient space in iCloud. what can be the reason for this issue?"

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Thank you for the screenshot.

If you have "Insufficient Space" for a Backup:

Just as it says "Insufficient Space". IOW: You don't have enough space to keep the backups. Note that an iPhone can only be restored to a backup of the same iOS version. So, maybe take this as a good reason to delete any backups that are of an older iOS version. Elsewise, upgrade you iCloud Plan, if an option to you: iCloud+ Plans and Pricing - Apple Support

comdini Said:

"Cloud Backup is getting failed.: Thanks for your reply @TheLittles. I got a clue from your reply.: Followed below steps & identified that which items are exceeding the limit. found the photo gallery. :)"

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You are Welcome.

Export, then Delete:

So, export the iCloud Photos, and then verify your can access the download. Once verified, trash them from iCloud Photos, considering that they are no longer needed in iCloud. See here: Download iCloud Photos and Videos - Apple Support