We would like to start backing up file data to external HD's instead of tape. It's cheaper, faster (USB 3.0 or eSATA), and doesn't require special equipment. I need to copy a large amount of file data (say 10TB) to several smaller external drives (e.g. 4TB each). The ideal solution would be something like robocopy with a "span" feature that would allow me to specify multiple destinations and when the first destination is full, have it move on to the next drive without stopping.
For example the solution would look something like this: somecopyprogram.exe /source: W:\ /dest: X: /dest Y:\ /dest: Z:\. ,where W: is my 10TB source disk RAID array and X,Y,Z are my 4TB external disks.
I've found plenty of tools for copying the same data to multiple locations (e.g. to copy a set of the same files to several USB flash drives at once), but in...