Hi @ORHawkfan, given that you’ll have two copies of your music library (Mac Mini, NAS) you can safely go with a one-drive NAS. Here are a few options for you …
… while QNAP and Synology are the ‘big’ names, the Buffalo is a solid choice for a simple NAS.
Copying your music library from the Mac Mini to the NAS is straightforward. Ditto for adding the NAS to your Sonos system in your secondary home.