I have three iPhones linked to my AppleID. (Don't ask me why, it began when Apple was not providing family access.) I already have iCloud Contacts, Calendars, etc. on my AppleID made from one of my iPhones.
Now I'm going to replace my another iPhone (which doesn't use iCloud Contacts and Calendars) with new one, and need to backup and move contacts and other stuff. Since I don't want to merge Contacts and Calendars, I can't use iCloud on the iPhone I want to backup.
Is it possible to change AppleID on the iPhone I want to backup keeping all the stuff untouched to link it to new iCloud account? Or is there another way?