Apple says that even after this update, apps and ringtones that “are no longer available for redownload” can still be synced by plugging in your i OS device, so I’m guessing (read: I hope) this remains a way of transferring over custom ringtones.
You should transfer these items to your i Tunes library before updating this i Phone. Would you like to answer one of these unanswered questions instead?
Make a new backup of your i Tunes library, or update your existing backup before you move it.
We’re taking these reports seriously as we know how important music is to our customers and our teams are focused on identifying the cause.
We have not been able to reproduce this issue, however, we’re releasing an update to i Tunes early next week which includes additional safeguards.
It also means that the exact cause of the bug is still unknown, although it appears to be a problem with the i Tunes desktop app misbehaving rather than the Apple Music streaming service.
Apple says it is considering all reports of music being deleted seriously and asks anyone affected by the problem to contact Apple Care.
Instead, Apple wants you to manage and download i OS apps from the i Phone or i Pad itself via the native i OS App Store application.
Users can download the latest i Tunes release from the software update mechanism of i Tunes itself, via the Mac App Store Updates tab, or from the i Tunes download page here.
Note: If you move your media to an external hard drive, you must connect that drive to your computer to access your files. We recommend to have the "Keep i Tunes Media folder organized" setting off, as this can move your files around, and invalidate the links Serato DJ creates to your tracks.