First of all I would like to apologize for if my English is not good (It's not my native language).
Thank you for your answer, but I get the feeling I didn't explained my request good enaugh.
Image file is one big file that contains the whole configuration of the device (photos, contacts, notes, JB, settings).
It's actually not an visual image. It is called "image" because it reflects your device content at the specific current time you created the image file.
If you set the image file back to the device - it will act just as it did at the time you created the image backup file.
Norton-Ghost does it to PC hardisks. My question if there is something that does that on iPhone.