If you annoyed of having to have your iPhone backed up every time you load the new Music app by Apple and sync your Apple device, please read.
As you may or may not know, iTunes is gone, that’s right, gone. More info. iTunes is dead and is being replaced with four separate apps: Music, Books, TV and Podcasts.
On previous versions, it was as simple as entering a one-line command in terminal: defaults write com.apple.iTunes DeviceBackupsDisabled -bool true
As this would work on iTunes, this won’t work in the Apple Music app. Here is how you can disable automatic backup on Catalina (no iTunes) on the Music app.
Find the backup folder
Quit the music app if it’s running.
Using Finder, from the file menu select: Go > Go to Folder…
Type the following path into the box and hit ‘go‘.
(Replace YOURUSERNAME with your Mac username)
Look for the folder called ‘Backup‘.
Right-click and select ‘Get Info‘. The information dialogue should appear on your screen.
At the bottom of the info dialogue window, click the user’s privilege on the second column where it says ‘Read & Write‘ and select ‘Read only‘. This should now replace the privilege for the main user from ‘Read & Write‘ to ‘Read only‘.
This should now disable automatic backup iPhone or any other Apple devices that run a backup on every sync.