It's probably not so much the data as the samples that they will have had in the liquid nitrogen/-80oC freezers. Those are probably samples from animals that are may now be deceased, and are now irreplacable. Hell even the loss of hundreds (prob more like thousands) of PCR products/cloning etc will take years to recover, if it's possible.
Fires in the lab is always a huge concern of mine, when I was getting ready to defend my dissertation I had so many copies of everything bc if something like that happened, I'd be so screwed. I'm glad the horses and people were ok, but damn. all that research.