Fig. 3 in R. C. Johnson’s 2008 article Gene Banks Pay Big Dividends to Agriculture, the Environment, and Human Welfare in PLoS Biology, takes the “small subset” approach and hints at storage, metadata and retrieval as well as administration more generally.
The figure is – like all PLoS content – available under a CC BY license and can thus be reused in any way if properly cited. Several Wikipedias – including the Danish and Indonesian ones – have chosen to do so in order to illustrate articles pertaining to seedbanks and related subjects. They all use a copy of Johnson’s Fig. 3 - Seedbank.jpg on Wikimedia Commons, which is thus today’s Open Access File of the Day.