I would like to use the speed of the local gigabit network to one way backup my photography files from one Drobo to another. After the initial sync, can I attach the 2nd Drobo offsite to another computer with the same one way key? Will the sending computer see the already transfered files and leave them, only updating new files, or will it attempt to overwrite? This is about 4 terabytes of raw files and edits I would like to have a offsite backup of. Thanks, Scott