Iphone backup want to save my whatsapps and Imessages?

So my Iphone is locked because someone changed my password and i can't access it, and i don't want to restart it without backing it up, but i don't know what i will actually get to keep. I want to keep my whatsapps and imesseges especially, but i don't know what to do… Please help… Oh and if you know how to re start it, please comment it too…

Ouch, what you will have to do is in iTunes backup your device. Your iMessages and all your apps will be backed up. But the data in your whatsapps will not be saved. Then in iTunes just click restore and your good to go.