Do you like Apple Music, or is the music library move based solely on the fact that you're going to be using an apple computer? I ask because I use an iMac and iPad, but I do not use Apple Music. A few years ago there were horror stories about how iTunes/Apple Music users lost portions of their local libraries due to one snafu or another (i.e. Apple match?). Instead, I use Plex to store and organize my music library. You can also use it for managing video and photo libraries, as well as streaming movies and TV shows. It plays all formats and allows you to enter all kinds of info if that's your thing. The search function is quite good and the results easy to understand.
Yes, yes, yes! My library is backed up on a weekly basis, or more frequently if I've done a lot of work.