Some users have asked or pointed out, and yes it is the case that the database copy would also include cached copies of posts from users on other instances in the Fediverse, and this includes direct posts or "DMs" which were sent to or included a Kolektiva.social user.
We welcome suggestions on how to most effectively notify (a lot) of Fediverse users in general of this, but we also ask for other instance admins to help by communicating this to their own users if it seems appropriate 🙏