If automatic backup fails, there should be a warning

[tgxworld (Alan Tan)]

Sure fixed in

https://github.com/discourse/discourse/commit/f6060bfbf6f8199a934668f559df6b87e96caac4

Note that inviting a group into a topic will now trigger the right notification as per

Inviting a group to a message does not trigger a notification mail

Fixed this in