making a exact copy of a HD

[Jason Clinton]

James Nelson wrote:
> Optionally you can use 'dd if=/ of=drive.img'  and create a file to store
> rather than dual harddrives.  Personally I like doing something like the
> following: 'tar -cvz `dd if=/ of=drive.img`'

Just a couple of newbish questions:

Isn't the above syntax incomplete? Whould you want to pipe the output of dd to 
tar? Or is that what's happening?

Also, wouldn't this include the contents of proc and dev, as well? Wouldn't that 
be dangerous?