I’m looking at options for setting up my first nas on an old pc. I have a 4tb wd red drive and I plan to buy another one to match it and have mirrored drives. My question is

How are people structuring their folders on their drives? Let’s say you have personal files, photos, a small video collection, security camera video files. Do all these files go onto the same drive? My goal is to simplify what I have now which is a few different drives on my pc and a Dropbox account. And also get rid of Dropbox.