I don't understand icloud. I backup stuff to icloud on my iphone and ipad yet when I go into iCloud.com on the web on my Mac I don't see stuff that is on the iphone and ipad.
There is no way to see those iCloud backups from icloud.com. Those backups are there in case you replace your iPhone or iPad, you can restore your data from that backup.
You can see Backups in Mac iCloud System Preferences. Navigate to "iCloud", then click the Manage button at the bottom. Highlight the Backups container and it will show the size and last update for each of your iOS devices.