I was commissioning a new phone system for a customer and as part of the process we are required to test 000 or 112. Pretty easy, called the number gave then the approved speel of this is only a test call for a new phone system and asked them to tell me what number I was presenting.
Never had to call because of an actual problem.
Not at all. You can set up an instance A then subscribe to a community another instance B and instance B will send all events in that community to you.
Now you have a local database with the comments and posts to mine data from.