Preserving data after re-deployment

Can it be possible that edits made to the deployed version must not entirely affect data collected prior. For example, Because of time and budgetary constraints, I am forced to change eg the logic of a template after users would have discovered bugs. If I corrected those bugs, data collected after I have re-deployed becomes un-usable.

Is there a way for the Kobo to still preserve data collected before any corrections?

Why does the data become unusable? If you do not rename any question or group, change the type of any question, or move any question into or out of a group, the data should not be affected at all. If you’ve found a bug, please let us know.