Cheaper backup mechnism for a server

[dhaneshk k]

Hi ;

A general question pls excuse me

can any body suggest a backup mechanism for a server machine , which has a 
web portal , email server ,PgSQL database 4GB size , DNS server, Mailman , 
and a mediawiki applications running in a single machine .

Can you suggest good solutions , for the server Backup mechanism    so that 
I can restore all the data just before the crashing moment .

pls share your expertise , it will help me lot  to secure my data in the 
server machine ..

Thanks in Advance
KK

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