Doubts with Restore image

Hi, i have the followings doubts …

  1. Can I restore an image from a external usb hard drive?

2 . Can I restore an image from directly from server without use the cd live?

reading the other questions I could solve one of my doubts.

Here more information how to:

I still have the doubt in how can I restore an image without using the live cd and without are on the client?