Hanlon's Razor is such an overused meme/trope that it's become meaningless.

It's a fallacy to assume that malice is never a form of stupidity/folly. An evil person fails to understand what is truly good because of some kind of folly, e.g. refusing to internally acknowledge the evil consequences of evil actions. There is no clean evil-vs-stupid dichotomy. E.g. is a drunk driver who kill someone with drunk driving stupid or evil? The dangers of drunk driving are well-known, so what about both?

Additionally, we are talking about a system/organization, not a person with a unified will/agenda. There could indeed be an evil person in an organization that wants the organization to do stupid things (not backup properly) in order to be able to hide his misdeeds.