How should images be backed up?
Copying to CD might be useful for short term backups but that on its own it isn’t a very sustainable *long-term* preservation strategy. The reason for this is that the dyes used by recordable CDs (CD-R) tend to break down over time. For more information, see section: 1.1.6 in Ross and Gow (1999). The same authors wrote in their executive summary that they felt that the stability of CD-R was over-rated and “far from being a secure medium it is unstable and prone to degradation under all but the best storage conditions.” Best practice would beto keep an additional copy on some magnetic media. For more details see: Ross, S., Gow, A., 1999, Digital archaeology: rescuing neglected and damaged data resources. London: South Bank University, Library Information Technology Centre, February. In practice, preservation is about managing information content over time. It is not enough just to make backups, but to create (at the time of digitisation) well-documented digital master files. Copies of t
