Well another command I have being using lately is the dd command. I have been playing with macosx, before I decided that they only way to use the product is to buy a mac. Which I have done. dd is usefull for making whole backup images for one hard disk to another, or from a image to disk and vice versa. The dd command syntax being using is:
bs is the block size that copy by. eg. more that 4096k can slow things down.
if is the input file/hard disk, or the originator.
of is the output file of the destination.