def backup(host=None, core_name=None, append_core_to_path=False):
    '''
    Tell solr make a backup.  This method can be mis-leading since it uses the
    backup API.  If an error happens during the backup you are not notified.
    The status: 'OK' in the response simply means that solr received the
    request successfully.

    host : str (None)
        The solr host to query. __opts__['host'] is default.
    core_name : str (None)
        The name of the solr core if using cores. Leave this blank if you are
        not using cores or if you want to check all cores.
    append_core_to_path : boolean (False)
        If True add the name of the core to the backup path. Assumes that
        minion backup path is not None.

    Return : dict<str,obj>::

        {'success':boolean, 'data':dict, 'errors':list, 'warnings':list}

    CLI Example:

    .. code-block:: bash

        salt '*' solr.backup music
    '''
    path = __opts__['solr.backup_path']
    num_backups = __opts__['solr.num_backups']
    if path is not None:
        if not path.endswith(os.path.sep):
            path += os.path.sep

    ret = _get_return_dict()
    if _get_none_or_value(core_name) is None and _check_for_cores():
        success = True
        for name in __opts__['solr.cores']:
            params = []
            if path is not None:
                path = path + name if append_core_to_path else path
                params.append("&location={0}".format(path + name))
            params.append("&numberToKeep={0}".format(num_backups))
            resp = _replication_request('backup', host=host, core_name=name,
                                        params=params)
            if not resp['success']:
                success = False
            data = {name: {'data': resp['data']}}
            ret = _update_return_dict(ret, success, data,
                                        resp['errors'], resp['warnings'])
        return ret
    else:
        if core_name is not None and path is not None:
            if append_core_to_path:
                path += core_name
        if path is not None:
            params = ["location={0}".format(path)]
        params.append("&numberToKeep={0}".format(num_backups))
        resp = _replication_request('backup', host=host, core_name=core_name,
                                    params=params)
        return resp
Tell solr make a backup.  This method can be mis-leading since it uses the
    backup API.  If an error happens during the backup you are not notified.
    The status: 'OK' in the response simply means that solr received the
    request successfully.

    host : str (None)
        The solr host to query. __opts__['host'] is default.
    core_name : str (None)
        The name of the solr core if using cores. Leave this blank if you are
        not using cores or if you want to check all cores.
    append_core_to_path : boolean (False)
        If True add the name of the core to the backup path. Assumes that
        minion backup path is not None.

    Return : dict<str,obj>::

        {'success':boolean, 'data':dict, 'errors':list, 'warnings':list}

    CLI Example:

    .. code-block:: bash

        salt '*' solr.backup music