using dd to backup entire hard drive

I want to back up a linux hard drive completely.

If the hard drive I want to back up is hda and I want to 'clone' the hard drive
to hdb, how would I issue the command?

dd bs=4k /dev/hda /dev/hdb

I want everything, including the mbr to be copied. Is there anything that I
need to worry about if the target hard drive is larger than the source hard
drive? Will the partitions be the same size and the extra space on the target
left unpartitioned?

Thanks,

Craig



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