When a user is created/blocked, when a backup fails/succeeds send a custom email message explaining the event.
When a user asks a question on the forum, provide them with the option to mark a reply as answering the question. The answer is highlighted so other viewers can quickly go to the answer rather than reading to whole topic. At present some moderators on the forum are closing the topic as a way to indicate the post has been answered. (see an example here).