Backup on data
How do I backup a device if I don’t have access to Wi-Fi
iPhone XS
Question marked as
you either need to connect to a WiFi network or you could connect to a computer and make a backup
How to back up your iPhone, iPad, and iPod touch - Apple Support
If you want that backup to be in iCloud, you need to be connected to Wi-Fi or the computer used to do the backup needs to be connected to the internet
