Clone USB-drive bit for bit

Question

I have a USB-drive that is encrypted with Truecrypt. Now, I'd like to make a copy of it from time to time, so I need a method of cloning the USB.

The two USB-sticks are of same size, brand, and type, if that matters.

Answer 1

You could use dd.

$ sudo dd if=/dev/<source> of=/dev/<destination>

If you want to know how much has been copied already, you may want to run this instead:

$ sudo dd if=/dev/<source> | pv -s <size in GB>G | sudo dd of=/dev/<destination>

You may need to install pv first.