Determining, in a geographically diverse storage system, a portion of a data chunk that comprises fewer non-relevant fragments of stored user data than the data chunk itself is disclosed, wherein communication of the portion, in lieu of the data chunk, can result in consumption of fewer network resources. Chunk table data that can indicate information about fragments comprising the chunk, such as memory locations of fragments, sizes of fragments, indexes of fragments, a relevancy flag, etc., can be determined and/or stored. In an operation of the geographically diverse storage system, such as generating a convolved chunk, deletion of a chunk, regeneration of a damaged chunk, etc., employing the portion of the data chunk can generally reduce consumption of network resources in comparison to communicating the entire data chunk itself inclusive of all non-relevant fragments.