Devil's advocate, but I really do wonder:
Someone please remind me why "Cloud" (some other entity has your data) or "Multiple Drive" solutions (RAID? Redundant array of inexpensive devices? They are all relatively cheap now!) are better than JBOD (Just a Bunch Of Discs.)
Is it that you have trouble organizing your files? *
My goal for backup is at least three copies of anything important, and one of those should be moved "off site" to another location for safety.
WHY NAS?
Do you truly require 100% availability? All files on line at all times? Why? Are you sharing files at all times?
*I have a program on my Mac called DiskTracker that indexes volumes so I can search for things which are not plugged in at the moment.
I just don't understand the "need" for all files to be available at all times, unless you are hosting a server for remote access. If you have told others that they could go to an Internet address and find a file, then I
DO understand. I just don't think most of us are doing that!?