Best solution to send digital files to my DAC

Another thing to consider is streaming services.  I use both Tidal hifi and Idagio.  Most anything I want to listen to is available from those services, so the need to go out and buy music, either physical or downloaded, is greatly diminished.  I will buy an occasional obscure recording, and I will buy records (another story for another time), but I have significantly downsized my collection of CDs.  I have about 75 CDs ripped to a hard drive (mostly alac, some Flac, about 50GB), but stopped when I realized most of that material was available on Tidal.  My 500 or so CDs do not take up much room, and I enjoy reading the liner notes!
Again, my approach works because I am completely satisfied with Redbook quality.  If you are pursuing higher resolutions, your life will become considerably more complicated and expensive.  I am blessed that I cannot tell the difference!

Check out Bluesound Node 2i or Vault 2i if you need to rip cds to its internal drive.  

You want a network streamer. Tons of these nowadays at different price points. The best one might be something like the Innuos Zen MK3

+1 on the Innuos Zen MK3.

For about 15 years, I used a Netgear ReadyNAS and Logitech Media Server for playing music files and streaming.  That solution worked well for me.  A couple of years ago, I migrated to a Synology NAS and stayed with LMS.  That solution worked even better.  

This year, I moved to Roon and haven’t looked back.  I now use an Innuos Zenith MKII CD ripper/network media server connected to a Mytek Liberty DAC.  SQ is great.  It’s a bit pricey.

I’ve never heard a Node 2, but there are a lot of folks on agon that give it very high marks.  

If you look at any music server, they are just a personal computer with usually a Linux OS of some type. I have been down that route. Most music servers use the inferior USB connection. Another thing you don’t want to do is have a music server with disks attached in your audio room. 1 more thing, the app that you use to play your music is very important too.
When you consider all of this, why would you buy a music server?
I use my iMac in a different room running Roon server, connected to my ps audio DS dac using Ethernet. I have used Auralic’s DS Lightning software and Lumins and they are very good, but still no match for Roon. The Mac allows me to use a raid disk setup for more fault tolerance, plus my data is backed up regularly, easily recoverable, and many local companies can fix the Mac if I can’t. What other music server can state that?