Sara Day Thomson has published "Preserving Transactional Data" in The International Journal of Digital Curation.
Here's an excerpt:
This paper discusses requirements for preserving transactional data and the accompanying challenges facing the companies and institutions who aim to re-use these data for analysis or research. It presents a range of use cases—examples of transactional data—in order to describe the characteristics and difficulties of these 'big' data for long-term access. Based on the overarching trends discerned in these use cases, the paper will define the challenges facing the preservation of these data early in the curation lifecycle. It will point to potential solutions within current legal and ethical frameworks, but will focus on positioning the problem of re-using these data from a preservation perspective.