Carsten Rönsdorf et al. have published "GI+100: Long Term Preservation of Digital Geographic Information—16 Fundamental Principles Agreed by National Mapping Agencies and State Archives" in the International Journal of Digital Curation.
Here's an excerpt:
This paper states 16 principles for the long term retention and preservation of digital geographic information. The paper is mainly aimed at public sector geographic information providers in Europe (particularly those involved in mapping and cadastre) with the intention of highlighting the significance of fundamental concepts for digital geographic data archiving. Geographic information providers include mapping agencies and archives that preserve geographic data among a wider range of digital information. A supplementary objective is that the paper may provide useful information for providers of all types of geographic information right around the world.
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