It’s not really 4 clones on the CCC destination…the Safety Net feature only copies changed files on 2nd and subsequent clones but the old versions are kept around on another folder if it is enabled and the Safety Net gets pruned over time like Time Machine as needed (at least I think it does…on my iPad at the moment). I tend to manually prune my Safety Net folders every few months because the majority of the old versions are LR catalog or previews files or things that were in the Archive folder but bot relocated periodically to the RAID on the desktop computer.