But I need to duplicate the data to pouch, then move it to couch. My question is how do the sync myself. How build the log so it be usefull to this task? To be

But I need to duplicate the data to pouch, then move it to couch. My question is how do the sync myself. How build the log so it be usefull to this task? To be clear, how is the algorithm for this? Any hint or open source example?