Install from HD, and before format tips

[(=?utf-8?q?=60=60-=5F-=C2=B4=C2=B4?=) -- Fernando]

I'm going to format and reinstall my laptop with the latest Gusty daily CD.
Two questions:
*Where can I find a nice HowTo to install Gutsy using the alternate iso, but from HD install?
*What are the usual things that everyone forgets to make backups besides the HOME dir? Stuff like Webmin config, crons, apt lists? tips are welcome.

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BUGabundo  :o)
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