File server Shadow Copies drive

Hi there, 

I have Shadow Copies configured. All data are on E drive, and Shadow Copies are on F drive. I have two question about the shadow copies drive. 

1. When I check F drive, I can see that drive has been used, but when I click into that F drive, it is empty. Can anyone explain to me why? I asked this because I can restore files from the shadow copies drive, but didn't see anything when clicked into that drive.

2. If that shadow copies drive is full, how do I clean up it as there is nothing shows up when I click into that drive.

Thanks!