Please could some experienced mastering engineers give me their views on the best formats to backup masters? Obvisouly if its 1/2" make a 1/2" copy, DAT- DAT Clone? Do glass masters get stored and if so who has them and where? If you were to make a copy onto CDR, would you save it as a BWF as Data or make an audio copy? Could this CDR then be used to make any more runs/ remastering and so forth or would it be useless?