Learn in the textbookOptions for Risk Treatment
DefinitionRisk diversification (リスク分散) is the idea of splitting assets, sites and the like into several parts so that a single accident or disaster cannot spread damage across everything at once.
ExplanationFor example, if work is spread over several servers instead of all running on one, a single server going down affects only part of the business. What sets it apart is that it narrows how much damage is taken at once rather than eliminating the risk itself.
AnalogyIt is like keeping your wallet and your cards in different pockets, so losing one does not mean losing everything.
Memory hookThe saying “don't put all your eggs in one basket” fits it exactly.