A method for execution by one or more processing modules of a dispersed storage network (DSN) includes 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. The method determines whether to increase a width dispersal parameter of the storage vault. When the width dispersal parameter of the storage vault is to be increased, the original plurality of storage units are updated to include at least one additional storage unit to generate an updated plurality of storage units associated as a next generation of the storage vault. The set of encoded data slices are stored in the updated plurality of storage units of the DSN associated as the next generation of the storage vault.