Avoiding losing all input data/info on forms before saving

When filling out fields onto a form on Alloy mobile, such as a Tree Survey in my case, it is possible to press the back button (the generic android back button) and lose all the information that was input onto the survey form, i.e. bye bye 30 mins of my time!

This is very frustrating as the back button can be pressed by accident and means opening the form again to refill all the information back in.

It would be great that if information has been input onto a form and the back button is pressed that a prompt appears to check whether you want to go back and lose all the information input - this seems a relatively standard practice on other platforms.

Something as simple as a pop-up saying "Are you sure you want to go back? You will lose all unsaved data" would overcome this problem and save lots of time having to re-input data.

Hopefully this can be considered.