How can I backup without a Wi-Fi
How to backup iPhone without wifi
How to backup iPhone without wifi
You can backup by connecting it to a computer no Wi-Fi needed for that. Choose the Backup with your Mac or Backup with your PC sections in the support document you posted from, or click below:
If you have an iPhone 12 or 13 connected to 5G cellular service ands the carrier supports it, you can backup to iCloud over cellular.
Back up to a Mac or a PC that has iTunes installed on the device using a USB to Lightning cable. Details in the link below:
How to back up your iPhone, iPad, and iPod touch - Apple Support
Please use iTunes on a computer.
How can I backup without a Wi-Fi