2024-03-10: Running Sonoma v14.3.1 on a Mac Studio M2 my iPhone v17.3.1 backup file path is as follows and it was not hidden in my case. I did notice that if you go back a few macOSs that there have been radical changes over the years as to the way Music handles it's backups. Are all of the Music files included in this general full iPhone backup to begin with? Music used to have it's own parent folder in the Library but I don't see it.
Here's the iPhone full backup path on my setup:
/Users/johnh/Library/Application Support/MobileSync/Backup/00008110-000835623613401E
It can be a fairly large file depending on your iPhone capacity and usage so you don't necessarily want be archiving old versions too often or too much. There's a way to create (and name) existing backups if you want them not to be overwritten, I think by holding down the option key in the "Manage Backups" window.
I believe older backups are getting picked up by Time Machine so that should suffice if you have to restore a prior backup. That means your may be increasing your TM usage quite a bit if you make frequent changes to your Music app.
For example, I deleted a playlist in Music by mistake and there is now way (that I know to undo that) and I probably could have just opened TM and gone back a day or so in time and restored that prior backup. I didn't want to take the chance of upsetting the apple cart in some unanticipated way so I never even tried this, but I'm assuming it would work. Instead I just recreated the playlist in Music in a few minutes.
But this begs the question, had I restored from a prior iPhone backup, other than any other changes, would this have worked to restore that missing playlist without creating any unanticipated issues?All the best,
All the best,
John