Gentoo ricer reporting in.
Ran a stage 1 Gentoo build whilst at uni back in the early 00’s. Man building that on my Athlon took an absolute age - and there was no easy way for me to read docs whilst I was putting it together.
Still, ran Gnome DE and did my dissertation on it.
For an organisation hosting as many companies data as this one I’d expect automated tape at a minimum. Of course, if the attacker had the time to start messing with the tape that’s lost as well but it’s unlikely.