DataBack from the name of the app you can get an interesting concept. Though this name may create a great image in your brain but the app will not do this. The app has a nice layout its seams its developer has work hard to achieve this design but having a good design it doesn’t mean that it will be useful.
It is a useless app you will consume more than 100MB of data and it will gives you 10KB of data some time I doubt is its function are working correctly. I have use may app which is supported by data back after the day I get around 100KB of data back from this useless app.
Though it will give you little amount of data but have some good feature also like speed test, you can measured internet speed with this app, I thing this the only features which is useful in this app.
So I would suggest you all to not use this app as it will do nothing.