What happens if you install a game/update twice with WUP Installer?

Nintendo1993

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Hello everyone

I have a question about WUP Installer GX2 on my Wii U. I am currently installing games and updates to my USB drive but I think I might have accidentally selected a game and an update that is already installed on my system.
What actually happens if you install something twice via WUP Installer? Does it just overwrite the old files cleanly, or does it create duplicate files that take up double the space on the hard drive?
I want to make sure I am not wasting space.

Thanks in advance for the help!
 
So if I don't see any duplicate software in the settings it just overwrote it? It can't be that it wrote the data twice but the Wii U software doesn't recognize it?
 

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