Next Backup Size too large

I would like to backup my iPhone to iCloud. I have deselected most apps using iCloud except a few with roughly 923 MB to be backed up. iCloud Storage says I have used 927 of 5 GB. Under iCloud Storage Info, it says I have one backup that I have tried deleting. I have clicked show all apps and deselected most of them. My problem is that under This Phone it says my Next Backup size is 7.95 GB. I feel like I have missed something critical but can't figure it out. Thanks in advance.