Luckily we have mirrors and these were not affected. We grabbed a new machine somewhere else (Scaleway ; if we name-and-shame the one we might as well name-and-greet the other) and immediately started re-importing our data to our new Master server.
All in all, it still took about 48 hours to get these 8-ish TB back online.
If there is any silver lining to this, it is that we could see a few points of vulnerabilities as well as our ability to turn things around in a reasonably quick manner (here be kudos for the two heroes who manage our infra).
Learning were made, and we will see in the coming weeks/months how we can implement new safegards within our resource constraints.
/END