A method includes identifying encoded data slices in need of rebuilding, where the encoded data slices are of plurality of copies of a set of encoded data slices stored in a plurality of sets of storage units of a plurality of dispersed storage network (DSN) memories. The method further includes determining a rebuilding strategy for the encoded data slices in need of rebuilding based on at least one of an urgency rebuild factor and a rebuild complexity factor. For a first encoded data slice of the encoded data slices in need of rebuilding, the method includes implementing a rebuild of the first encoded data slice in accordance with the rebuilding strategy to produce a rebuilt first encoded data slice, and sending the rebuilt first encoded data slice to a first storage unit of one of the plurality of sets of storage units.