While updating to ios 6.1.2 my iphone got lock showing connect to itunes, what i have to do so not loose my all data

when i tried to update my iphone 4s from ios 5.1.1 to ios 6.1.2 connecting through other wifi personnel hotspot connection., my iphone got switch off and showing connect to itunes with "itunes round logo" and usb cabel connection
please help me what i have to do, so i should not loose my data in iphone (messages, contacts, photos and videos etc.)
also i was confused weather i should do restore my iphone through itunes, will my all data erase?
there also showing that after restore i can get back my all data and settings?
please help me
vishal.

firstly thanks for quick reply.
sorry sir,
i am confused in last line you wrote,
" This will erase the phone but you will be given an option at the end to restore to an existing backup, if you have one."
i did not understand last sentence  -  if i have one? you mean to say if i have data or not in my iphone?
i have many pictures, messages, contacts which are very much important.
so will it be all restore and will be backup again in my iphone if i restore?
i am extremely sorry to interrupt you again.
waiting for your quick reply
thanks and regards,
vishal

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