Transfer from a SSD to Two HDD’s simultaneously (offloading camera media and backing up during a film shoot)

This would be extremely useful. Currently we either manually use the OS or software like shotput pro. I would buy this for every computer if I knew it could make an offload and a backup copy to a separate hard drive simultaneously with little or no drop in speed performance. 

From what I saw it appears the software cannot do this right now...or am I mistaken?