• 準備じゅんび — preparation
• 設備せつび — equipment; facilities
• 整備せいび — maintenance; servicing
• 常備じょうび — keeping on hand; standing (forces)
• 不備ふび — deficiency; inadequacy
• 予備よび — reserve; spare; preliminary

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The left part 亻 means “person,” while the right part (from 畀) originally suggested gear or a container. Together, 備 depicts a person getting things ready or equipped — hence “prepare,” “equip,” and “provision.”

災害さいがいに 備そなえて 水みずや 食料しょくりょうを 用意よういしました。
We prepared water and food in case of a disaster.

この部屋へやには エアコンが備そなわっています。
This room is equipped with an air conditioner.