How to backup without using wifi
How to backup my stuff without using wifi
iPhone 11 Pro Max, iOS 14
Question marked as
How to backup my stuff without using wifi
You can backup to a computer. Apple has links to the instructions in How to back up your iPhone, iPad, and iPod touch - Apple Support
For iPhones with 5G capability - iPhone 12 or later - under certain conditions you can use phone data to backup. See Use 5G with your iPhone - Apple Support