There's probably already a bunch of ideas posted for this but I couldn't find any after a quick search. It would be helpful to have some planner triggers, specifically one for when a task was deleted (or at least modified, including deletion).
MS Planner doesn't have a recycle bin. Once something is deleted, it's gone forever. (I couldn't believe when I first found this out.)
With a delete trigger in Flow, we can create our own backup. Please implement a delete trigger, or give us an ability to recover deleted items in Planner.
This should be a high priority. If data security cannot be guaranteed, we'll have to give up this tool no matter how good the other features are ... ๐