I need an expert in android app development to work on a backup project

I am currently working with a team of developers & would like to complement this team with an expert who specializes with back-up from android devices. You must have ability to ensure that our current app is able to backup all items as required through all versions to 6.o and above. The app is available and working for some versions & some class of data. The app backs up various data & relays to the central database on request. Please get in touch with me if you have such expertise to discuss further.