How do I save my videos and photos before restoring?

hi happy holiday to all'

While taking pictures my IPhone 4s went blank and when after holding down the home button and start a symbol telling me to connect to ITunes appeared and is frozen there.

The above diagnoses tells me I need to restore however it also tell me to save what's on

there for restoring will erase it.

I have many videos and photos on there. How can I save them if my phone is useless ??

Thanks in advance for your help.

Angelo