You need more than one copy. Folk that drive down copies to one are the most likely to lose them all. Be sure you are not confused with a Windows File Explorer bug too. Here's the link on that.
Backups are a good thing.
Last week I did a clean Windows 10 home install. I transfer some of my documents, pictures etc from windows 7. In particular I noticed 3 folders contain the same pictures. Under properties it says my name and one drive as the location. I really only need one location, not three. This one drive makes for a messy file system in my opinion. Is there a way to simplify this, like one folder? Trying to make sense of this has me a bit confused.