What is the best place to archive my digital music files?

Your post is a little vague, but the “best” place to store your digital music files is on a solid state drive.  You can plug into the Marantz’s USB port and presumably play from there.  I picked up a very cheap 8 Tb USB drive, to which I back up all of my music from my server and in an emergency, (like a potential hurricane) can grab it and put it in my pocket, just in case.

Thanks to everyone on this thread.  I will confer with a specialist at Audio Advice and come up with a hardware plan. Really appreciate the help.

I can almost guarantee that if you would’ve been more forthcoming about what your situation was, you would have gotten a much better response from this community. Thinking that a 20-year-old kid is gonna have the vast wealth of knowledge that is on this site… Good luck! 

gkelly- Your first and second responses were very helpful and will lead me to find a good solution.  Let's just leave it at that.