Your iPhone backups always get put in the same location. You can copy whatever files out of it you want, but don’t try moving the folder itself as you’ll break the backup process. To find them ...

If you back up your iPhone, iPad, or iPod touch, you’ll have a copy of your information to use in case your device is ever replaced, lost, or damaged. Choose a backup method Before you get started, learn the difference between iCloud backups and backups

Select “This computer” (in iTunes) or “Back up all of the data on your iPhone to your Mac” (in Finder). You’re going to want to encrypt your backup for increased security.