Database Usage & segmentation

Hi all
I like to understand better what kind of relationship occurs between segmentation profiles and DB usage.
From the developer guide I know that archived data are sensible to the segment.

Does this mean that:

  • if my site has no segments configured DB usage is X
  • if my site have 100 segments configured, I should retain 101X DB space? (1 for the basic non-segmented reports and 1 for each segment)

Is it correct? Does this applies just to visited reports or to all possible report segments?

Thank you