Izaak,
Each Enterprise Dashboard will have its own database, but starting with DevTest 10.3.0, a new licensing model will be used, so it will matter what version of DevTest you are .
The Usage data is not allowed to be purged from the database, so it stays in the database always.
As far as if the Enterprise Dashboard crashes and you lose data, I would reach out to your CA Account team for their recommendation.
~Marcy