If I switch a project's "community" setting from "comments" to "discussion board", what happens to comments that were already posted?

I'd like to avoid losing those comments, but I'm guessing they won't be automatically migrated to the discussion board (not even really sure that would make sense).

Normally, I'd just make the change and see what happens, but I'm not sure if the comments would come back if I switched back to the "comments" setting.

Thanks!

Yes, they'll come back if you ever revert the setting. When you switch to a community, the comments are only hidden. There are plans to either migrate them in the future, or else make both available at the same time, but no timeline. For now, rest assured that comments are preserved in case you change your mind later.