Comment by perlgeek

That's why the top-security DCs that my employer operates have large quantities of Nitrogen stored, and use that slightly lower the O2 saturation of the air in the case of fire.

Yes, it's fucking expensive, that's one of the reason you pay more for a VM (or colocation) than at Hetzner or OVH. But I'm also pretty confident that single fire wouldn't destroy all hard drives in that IT space.