iPhone back up location

Please look at this article: https://reincubate.com/support/how-to/change-itunes-backup-location/

And more specifically, look at the "How to restore the iTunes backup folder to its original location" section.

Clintdsouza wrote:

My iPhone back up location was changed to a external Hard drive on my MacBook Air. I’ve now got a MacBook Pro with 1tb so I now want to store my iPhone backups on the MacBook Pro but after migrating my data across from the air to the pro the pro still wants to back up to the external drive. Can someone please tell me how to return the backup location back to normal on the MacBook Pro.

See if this helps: https://support.apple.com/en-us/HT203977#computer