As long as it belongs to that section and you don't violate a forum rule then it should be fine.
This. And to add to that, It'd probably be a better idea to simply edit and just adding stuff on your main post instead of making a new reply daily. That way, it's more cleaner looking and less spammy.
Though the purpose of replying to the thread is to track the history - the purpose of having a diary. It is like a timeline in which you can record your achievements, failures, learning, and mishaps.