old & incomplete backup

You won't be able to see what is in them. I prefer doing computer backups because iCould backups are unreliable in my opinion. See About backups for iPhone, iPad, and iPod touch https://support.apple.com/en-us/HT204136. The document covers and contrasts both types of phone backups. And, it identifies the things not included in iCloud backups. I don't like backups where important things, such as photos, are not included in the backup. This might be a good time to switch to computer backups if you have consistent access to one. From the above document, see: Learn how to make a backups from your computer (including a PC).