I’m happy to announce you that I’ve packaged Question2Answer for YunoHost.
It’s currently available at GitHub - YunoHost-Apps/question2answer_ynh: Question2Answer package for YunoHost
I would like to move it to YunoHost-Apps, but I don’t have the right to do it at the moment.
The update and backup scripts should work, but are untested at the time of writing this. (Because there has been no update)