rsync or dd to clone a hard drive?

[Maxime Alarie]

I have never used dd to clone a hard disk.  

 

I use rsync for a lot of   my backups , and I was wondering what would
be the best tool to clone a  disk.  I don't want 3rd party software
also.  I want built in command  line tools.

 

I know rsync will resync where it left off if I encounter a problem,
what about dd?  Do I  absolutely have to creat an image before cloning?
Ex: dd if=/dev/sda of=sda.img   or I can use dd if=/dev/sda of=/dev/sdb?

 

Thanks.

 

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