iPhone back up questions

Hey guys. I have a back up from January that I would like to restore my phone to, only to retrieve some photos that were on my phone at the time. However, now that I've been using this phone for 2 months, I need all the information on my phone now. So, the question is... how can I create a back up of my current phone, restore it to the one from January, get what I need off of it, and then restore it from the back up created from the current one? Thanks for the help.