You can find All versions here Odin3
Not AFAIK. If you want to do an image backup it's best to do so using a custom recovery environment like TWRP.Does Samsung's Odin tool, have some specific function to create system images of Samsung devices ?
Just to remind others that this XDA thread is the original source of Odin.
Other sites like "samsungodin.com", "samsungodindownload.com", "odindownload.com" are all fake.