Get list of existing archives.
        :return:

def archives(self):
        '''
        Get list of existing archives.
        :return:
        '''
        arc_files = []
        tmpdir = tempfile.gettempdir()
        for filename in os.listdir(tmpdir):
            mtc = re.match(r'\w+-\w+-\d+-\d+\.bz2', filename)
            if mtc and len(filename) == mtc.span()[-1]:
                arc_files.append(os.path.join(tmpdir, filename))

        return arc_files