How to transfer google font to offline server

I have using google font in my application.

This is the url:

 @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);

I would like to download and use them locally.

google font apis shows a bunch of @font-face.

Do I need to download each of them and save them locally or just download one of them?

via Chebli Mohamed