How to copy an app from my iPhone to a Usb?

I heard people where paying thousands of dollars for phones with flappy bird but I don't want to sell my iPhone 5 so I was wondering if it was possible to A) copy an app to a USB and people install it to their computer or B) copy one of my back up folders and they install it as a back up. Also another problem is I've backed up my phone multiple times but my mac still tells me I have no back ups and on top of that when i went to sync my phone to see if that helped it said it was going to erase my data.
thanks

(your not allowed to copy me or ill have you exploited (lol but seriously don't copy) TM)

Use a apk extracter on your phone to make the apk file of flappy birds and den connect your phone to your computer and simply copy paste the apk file… Den u'll be able to share de game. Dats wat i did… So basically its not your idea.

Solution:

Buy an Andriod so you don't have to download third party applications to access your phone and you don't have to use itunes. I can back up my phone in 15 minutes and edit the back up whenever I please. Also i can extract flappy bird with one simple click and share it with whomever I like.

If you have jailbreak your iphone, you may try to use itools to copy flappy bird to an usb.

If you like this game too, you may find a complete flappy bird video guide here:

http://www.appeggs.com/com.dotgears.flappybird,video-guide/