In a multiple-drive configuration that does not send data over the network, the configuration has an equal number of read and write drives, one master server, and multiple media servers. A separate duplication process runs for each read and write drive pair during a duplication operation. If you designate an alternate read server (media server A) for reading the images to duplicate and if the destination storage unit also resides on the alternate read server (media server A), no data is sent over the network.