During this period, 2 disks died at his place on the Raid 5 NAS backup, and nobody noticed.
In all this "RAID is not a backup" back-and-forth, has nobody noticed that the NAS was the backup? Multiple disks failing on the backup is not a problem. since you've still got the main copy (i.e. the main respository if you're a company with things like websites). You just laugh and renew the backup.
Now, reading between the lines, it may be that this deployed (production?) VM with the website may have been the 'main' repository. In which case, the failure of this company is only a question of a (rather short-term) when. Suicides of lead developers notwithstanding.