remove duplicated methods

        joblib.dump(ccds_refs_dump, os.path.join(dir_dump, "ccds_refs.joblib"))

        return ccds_refs_dump

    def dump_dfs_file(self, file_path: str, dir_dst: str = None) -> str:

        """Copy DFS file to output directory."""

        # by default, dump file to output directory

        if dir_dst is None:

            dir_dst = self.dir_output

        # if use OSS,

        if self.use_oss:

            # download OSS file to dst directory

            return self.download_oss_file(file_path, dir_dst)

        else:

            # copy DFS file to dst directory

            local_file_path = os.path.join(dir_dst, os.path.basename(file_path))

            self.copy(self.abspath(file_path), local_file_path)

            return local_file_path

    def dump_ccds_refs(self, refs: dict, dir_dst: str = None) -> dict:

        """Copy raw file from CCDS to output directory."""

        if dir_dst is None:

            dir_dst = self.dir_output

        local_refs = {}

        for ref_name, ref_path in refs.items():

            local_file_path = os.path.join(dir_dst, os.path.basename(ref_path))

            local_refs[ref_name] = self.copy(self.abspath(ref_path), local_file_path)

        return local_refs

    # time operations

    @staticmethod

    def now() -> str: