“THE SVALBARD SEED VAULT has the capacity to store 4,5 million different seed samples … a maximum of 2,25 billion seeds may be stored … will therefore have the capacity to hold all the unique seed samples that are conserved today by all the approximately 1400 genebanks … all over the world.”
http://www.regjeringen.no/mobil/en/dep/lmd/campain/svalbard-global-seed-vault/frequently-asked-questions.html?id=462221