Can’t I backup up with cellular data?
Can’t I backup up to my iCloud with cellular data?
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With iOS 15 it is now possible to Back Up Over Cellular however it is carrier dependent (i.e. only available for carriers that offer 5G support and enable the feature on their network). Here is an excerpt from the iOS manual:
On models that support 5G, your carrier may give you the option to back up iPhone using your cellular network. Go to Settings > [your name] > iCloud > iCloud Backup, the turn on or off Backup Over Cellular. - Source
If you're outside of North America, you will see the words Mobile Data in your settings instead of Cellular.