takes breath, licks lips So what I have is a catastrophe, but it works. Master device: Mac Mini 2014, which is an unadulterated chunk of shit Backup: Carbon Copy Cloner speaking to an 8-bay Synology DSM Sync A: Plex, also running on the Mac MIni, at least for now (might become an nVidia Shield) Sync B: Google Play Music Playback A: Google Play Music, which I don't pay for Playback B: Plex, which allows local download to Android and iOS It has the advantage of giving a couple pathways to success. It has the disadvantage of requiring a closetful of tech. Google will tell you that if you sync to Play Music, you can restore from it like a backup. THEY'RE LYING. I had to do that and it failed out of about 60% of my music. The Synology allows you to back up to Crashplan or Amazon, and I do. And I could probably cook off iTunes at this point and just go Plex but the Plex music interface isn't quite there yet. Maybe another year or so.