I want to backup my iCloud with data

Wi-Fi is needed in most cases but there is a new option available with iOS 15. See the following from Back up iPhone - Apple Support

Note: 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, then turn on or off Backup Over Cellular.

KESTERMARIS12 wrote:

I want to backup my iCloud with data

sorry wifi is a requirement to backup via icloud for you iphone 7.