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ps | grep dd
If dd is no longer running, I guess it crashed silently. There is just not enough time to have it copied the whole disk. I know USB3 disks on an USB2 port can be a bit faster than USB2 disks on the same port, but it can never exceed 40-45MB/sec, as the port is not faster. Then you would still need about 16 hours.
I don't know how stable the USB implementation of the 210 is. Maybe it's just not stable enough to copy 3TB in one run?
If dd silently stopped, I guess you'll have to do the copy action on your PC. In that you need to connect both disks to the PC. In Linux you'll need to find out (using 'cat /proc/partitions') which partition is the data partititon, and which one is the usb disk. Then copy it. Unfortunately it is possible that you can't just copy the whole disk, as your usb disk is 4 sectors (2kB) smaller than your NAS disk.
Maybe this can also be done in Windows. Don't know about the features of dd.exe