Yes, mine went from 64GB and ended up at 39.3 GB (42,302,558,208 bytes), containing 212 Files, 12 Folders.
I archived the entire installation before launching the game because I thought I might give it to friends if they wanted to try the game so they wouldn't have to download it. It took forever (hours) for me even though my Internet is 1000mb/s. The server appears to be capped at about 100mb/s. I feel they need better servers for this because it is so large.
I intended to put the files on a couple of Blu-ray discs, but for some reason, it won't work. The discs show about 25b bytes (23.3GB), but I can put only 9.5GB on each and then it says they don't have space. It's weird. Tried all sorts of file tools: ImgBurn, UltraISO, Windows, etc. No go, so I'm getting some 64GB flash drives and hope to put it on there.