'Update the properties of a backup target
:param target: Backup target to update
:type  target: Instance of :class:`.BackupTarget`
:param name: Name of the target
:type name: ``str``
:param address: Hostname, FQDN, IP, file path etc.
:type address: ``str``
:param extra: (optional) Extra attributes (driver specific).
:type extra: ``dict``
:rtype: Instance of :class:`.BackupTarget`'

def update_target(self, target, name, address, extra):

    raise NotImplementedError('update_target    not    implemented    for    this    driver')
