Set the cache property to start/stop file caching for this archive

def is_cached(self, version=None):
        '''
        Set the cache property to start/stop file caching for this archive
        '''
        version = _process_version(self, version)

        if self.api.cache and self.api.cache.fs.isfile(
                self.get_version_path(version)):
            return True

        return False