THE SINGLE BEST STRATEGY TO USE FOR TROUBLE BACKING UP IPHONE TO COMPUTER

Thanks for all your help but nothing worked as I still can’t do an iCloud back up. I did every little thing you reported as well as restored from scratch and the two my iPhone thirteen & iPhone XR concurrently can no longer backup to the cloud. I also reset my modem but anything will work on both equally iPhones just the ICloud back up no longer