[hythloday]

The underlying cognitive bias in "I don't need backups, I use raid1" seems to be the quite common one of "I don't do anything stupid, so I don't need anti-stupidity devices" (feel free to substitute "careless" or similar for "stupid"), maybe with a side-order of "if I set up systems that protect me from my stupidity then only stupid people will want to work with me". The fact is, most of us do many stupid things every day--some stupid at the time, some stupid in retrospect--and systems that don't let us recover from them are poor systems.