If these are all the exact same model, you could try something like a Linux boot disc and use DD over Netcat to make a block-by-block copy of the drives, assuming the boot disc sees your network card. I use Rescue-is-Possible (RIP) Linux and sometimes have to run netconfig to get it to see the network properly but I've had good luck with it.
I've also used Partimage with RIP to make and copy down imaged drives.
I also use RIP to copy to and from SMB shares using samba to mount the share. I create a directory under /mnt and stick the file share there and then use that as a destination for the image.
Partimage takes some getting used to since it's rough on the edges. If you use DD you could just image it directly to the share piping it through gzip to compress it, then decompress it on the download to a new system.