What do I need to backup before upgrade to php 4.2.3 mod_perl 1.27 and apache 1.3.27

I am now with apache 1.3.22 php 4.10 zend optimizer v1.2.0 mysql 3.22,
I want to upgrade to php 4.2.3 mod_perl 1.27 and apache 1.3.27

What do I need to backup before upgrade? Will I need to re install zend optimizer after upgrade?

What do I need to know before upgrade?

 

 

 

 

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