储

Left indexing person radical 亻 - left-side form of 人. Anchors 储 in the human-affairs family alongside 备 (prepare), 蓄 (save up). Storing was originally an act of human stewardship: the 储 was a person who safeguarded the royal heir's resources (储君 = crown prince, the "stored ruler-to-be").

Right 诸 supplies the sound (zhū → chǔ through Old Chinese zh/ch alternation). 诸 itself means "all, various," lending a faint flavor of "storing many things" - fitting the meaning. Simplified from 諸; same phonetic family: 都 (all), 著 (notable), 暑 (heat), 署 (office).