Can I backup my iPhone pictures to my Mac?

The phone is formatted for Windows. I want to be able to run the phone so that the computer recognizes it similarly to a flash drive or external hard drive so that I can simply drag and drop the pictures to my computer, unless there's another way to do it. If I had to reformat the phone, would doing so erase all my pictures?

Yeah, it is easy to backup iPhone pictures to your Mac, as for me, I used iStonsoft iPhone to mac transfer app for one year, so, I will recommend it to you.

Here is the guide:

http://www.istonsoft.com/iphone/export-music-from-iphone-to-mac.html