Cloning methods

[Nagy Daniel <n.dani86@gmail.com>]

Hi, again :) :S

What's the best method for cloning a partition? [searching for an
open-source software alternateive for it :P]
I mean cloning like in norton ghost, a program that could "leave" bad
blocks behind, when cloning, and not making a 10 GByte output file
[like the partition size is], but just a eg.: a 3 GByte file [because
3 GByte was used in that partition, all other 7 GByte was free]?
[The main goal is to install os on eg.: 15 computers, but only with
one physically install in the "reality"]

Thank you!

regards
david