The UREACH Daisy-Chain uses “Asynchronous” technology which makes it possible of nonstop duplication. When copy start, the data will be loaded to each duplication tower’s HDD, then each duplication tower in the daisy chain will start working simultaneously. They will follow the first tower’s instruction to start or to end the copying, however, the daisy chain duplication will not be affected by any interruption such as linkage broken, or power off, each tower can work independently to continue copying even without daisy chain linkage during the copying. Furthermore, when finished, each tower can continue the same source duplication by itself, no need to wait for other towers job finishing.