Revisited Topic - Running a Nucleus and iTunes and New Additions to Library

The topic of synchronization between music folders (whether iTunes, FLAC, etc.) stored on an external device and the Nucleus has been discussed, but not solved. For those of us that have large music files located on a network drive, is there a good mechanism to sync those folders of music data with the data on the internal SSD drive of a Nucleus Plus?

Currently doing the same with a Mac Mini running as the Core. I use the program Chrono Sync and it works brilliantly. Leaning toward a Nucleus to integrate into Control4 system, but have not been able to find a mechanism to sync. Any thoughts?