You're on the right track. As you've already found out - that file is simply a direct block device image, so dd is your best friend here. As for the speed - that hugely depends on the SD card and card reader you have. I'm not sure, but you can try playing with the block sizes (bs and count options) to make it faster, but I don't have any specific advice here - that's just my educated guess and the direction I'd look to if I needed to do that myself :-)
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