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I’ve seen others mention the redundancy for the PSUs. One note about that, they are meant to be plugged into 2 different circuits! Otherwise, if they are on the same one and it fails, then redundancy is out the window.
Not a requirement, but if this is going to be a data hoarding type deal or you want it highly available for your purposes, then you should make sure you keep this in mind.
On that same token, read up on RAID Levels for hard drive redundancy.
In my experience (USA), it is magnitudes more than “some people”, unfortunately.
People read 1984 and thought, “Winston is my hero!”