My company does some work for HM Land Registry. In their foyer they display awards for having the biggest Transactional Database in the world. This article discusses it. In 2004 it was over 18 terabytes. I know various thngs that have/are going on that will significantly increase this.
Essentially they have every version of every title deed, and every version of every Ordnance Survey street level map going back many many years. Many of the Title deeds are hi-res scanned images.
It all depends how the data is stored, if they stored it as textual data in a correctly normalised database rather than high res scanned images where applicable then their data sets would be a lot more efficient and smaller in size.
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