iTunes Error 13010

Is the iTunes Library.itl file stored on the Time Capsule too, or just the media folder? See Make a split library portable for some background. Although I generally recommend keeping the library in a portable shape in a single location if the media is held on a network share then having the library files stored locally should give better performance.

tt2

beefqueen wrote:

I am using iTunes on my 2017 MacBook Pro (OS X 10.13.4). I'm an Apple Music subscriber and use iTunes Match. I am hosting my iTunes library on my music folder in my Time Machine, given the size of the library and the size of my MBP hard drive.

That sounds like all kinds of wrong, Time Machine should be there as your backup. You shouldn't be routinely accessing data inside it. Perhaps you mean a separate folder on the same volume that you use for Time Machine, although ideally you want to keep your library on a different drive and allow TM to back it up along with the rest of your computer.

tt2

So the one in the Time Capsule is the active library. See the section on Network Performance.

tt2