What data are you looking to see? It should back up your contacts with the gmail account so they'll be visible when you access the account via a PC.
It will also backup/associate the apps you've installed to the gmail account so that were you to factory reset, get a new phone, you'd be able to install them again etc.
I'm sure it does settings too, like WiFi configs etc, but you don't get to see any of that stuff.
Are you referring to photos and stuff on the SD Card?