Where do i find all the stuff ( photos etc) that have been saved to the computer iPhone 4?

My kid had a row with her best friend and deleted all the best friend photo's…
She has an Apple account and supposedly it backs up the contents of her iPhone 4 to her computer…
BUT we can't find where…
iTune's maybe?
Thansk

Added (1). Sorry I forgot to mention Which Computer OS
WIndows 7 pro
She has iTunes installed…

Added (2). thanks but Where and How? On iTunes… When I find her phone all I get is the possibility to delete the backup but not Open it.

It will be backed up in iTunes or iCloud, check the both and do install, Leo Privacy Guard in your device, it will make your device totally secure and also you will like to know that this app is in the top ten list.

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