Icloud does not do a full backup to icloud

I have an Iphone 11 Pro Max and i have used 60gb out of 512gb on it. I backed it up to icloud but icloud only backups 16.1gb. The last time i checked my estimated backup size, the sizes of the app dun match with what is on my iphone storage. I would like to know how to do a FULL icloud backup. Thanks