I have a new 128GB Macbook Air. I bought the small one because when it's docked, all of my music and photos will be on a connected external drive. My iPhone backup would eat 100%+ of my whole system drive for just one backup, but it doesn't seem like there is an easy way to move the location of the iphone backup in iTunes. I've seen a few people selling $50 software that claims to do it, and I've seen a few terminal commands that are supposed to do it, but the commands don't seem to work. Is it possible to do this? I'm using MacOS 10.14.5