If you do the NAS, then you'll have a separate backup in case the 2TB drives are troublesome. You can easily remedy any problems by moving to 1TB drives and adding a TwinStore for extra storage.

I have a few hundred CDs to go before I get to 2400 but I'm hopeful that M comes up with ways to support more media to fill the space (multichannel, video).

Regards,
Bill

Theater: 861v8+ID41, 218, (2) DSP8KSEs, DSP7200VCSE, (2) DSP5200s, Marantz UD9004, (2) JL Audio F113s, Roon
Whole House: 218s, DSP520s, DSP 320s, Roon
Office: 218, DSP3200s, Roon