Backup in iTunes
I just purchased a new iPhone 12 pro max. Every time I plug it into my PC it always tries to backup to iCloud which I don't want. I have to keep changing the setting to the computer. I have the latest update 14.2 on the iPhone and the latest version of iTunes. My old iPhone 7 Plus never did this. Once I selected backup to my computer that's the way it would stay. As far as iCloud I only have my photos and documents backed up on iCloud.