backup a whole disk?

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Hi,

What is the best way to backup a whole disk? (Like ghost under 
DOS/Windows?) Can I simply
  dd -if /dev/hde -of /home/backup/backip.img
and dd it back when necessary? 

This, if feasible, is not at all efficient since empty spaces are also 
copied. Is there any better way? I can not use tar/cp -r since I would 
like to keep partition information as well.

The whole story is that I need to backup a disk before I resize an ext3 
partition on it. I hope parted will do the job well. Any success story?

Many thanks in advance.

-- 
Bo Peng


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