I recently purchased a Nexus 7 tablet from Google and I also have a Samsung Skyrocket from AT&T. Neither of the devices is rooted. I'm not too enthusiastic yet about rooting either of them, especially since it voids warranties and severely limits support options. Is there a way to obtain a complete image backup of either (or both) of these devices via the USB port on my Windows computer? If so, how? Thank you!
This might help: [GUIDE] Full Phone Backup without Unlock or Root
Although it is talking about Galaxy Nexus, but this method is completely compatible with your Nexus 7.
Most articles I have encountered where people wish to undertake a complete image backup of their device requires root. However I have come across an article written in How-To Geek entitled "How To Create a Full Android Phone or Tablet Backup Without Rooting or Unlocking Your Device".
The Article will take you throught the steps of :
The article concludes by saying the complexity of using the Android SDK to create and restore backups is a bit much for the average user.