Simple question - Where are KM Documents Stored

Hi Folks,

             I am new to SAP EP/ KM

My client is looking forward to  using KM folders for storing all process documents. We want to access how much size the current system can hold.

Can you pelase tell me the following:

1) Where are KM documents stored. I mean the physical location. What is the file path. We have SAP Netweaver Portal.

2) How can i find the size it can hold.

Thanks a million for helping me out.