Nokia Suite 3.8 - Do I lose the music tracks I have downloaded with my Comes With Music or Nokia Music Unlimited subscription when I update my phone to Nokia Belle software?

If you have the music tracks stored on a memory card or mass memory, all your music tracks are kept safe during the software update to Nokia Belle. If you have the music tracks stored in the phone memory, they are only backed up if they are in C:\Data folder. DRM music licences required to play the music, however, cannot be backed up so you need to relicense all the copy protected music tracks you have on the phone.