Fallout 4 100GB???

[Aslanthelion36]

So I was moving fallout 4 from an HDD to an SSD and it said it uses 100GB of storage? When I downloaded it it didn't have nearly that much. I dont have many mods, why could this be and what can I do to reduce the storage without deleting my progress?

 

[RCFProd]

Have you accidentally installed the Ultra-HD texture pack released a few weeks ago?