ServerIdentifier

  The identifier for the server. Default: The official hostname,
  followed by a colon and the full path to the configuration file.
  The server identifier can be used to become independent of the
  server machine name. This might be helpful, if the backup server
  should move to another machine. Whitespace characters may be
  used in this identifier, but they are replaced with asterisks *
  before comparing, so they are not significant