1. A method for execution by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), the method comprises: storing a set of encoded data slices in an original plurality of storage units of the DSN associated as a current generation of a storage vault; determining whether utilization of the original plurality of storage units is greater than a utilization threshold; when the utilization of the original plurality of storage units is greater than the utilization threshold, updating the original plurality of storage units to include at least one additional storage unit and a proper subset of the original plurality of storage units associated as the current generation of the storage vault to generate an updated plurality of storage units associated as a next generation of the storage vault; and storing the set of encoded data slices in the updated plurality of storage units of the DSN associated as the next generation of the storage vault.