Big problem with RAID

[Supreet Sethi <supreetsethi@xxxxxxxxx>]

Hi guys
   I am working for a company called ICRIER which has got a machine which was 
   spine of the whole company. RAID was implemented on it. It ran mail, DNS,
webserver , proxy and samba
   
   Now the RAID has failed because 2 drives of the RAID failed.
   I am not sure it is hardware problem or software.
   
   I want to know
  a What are chances of such a thing happening
  b Is the data retrieveble in any way
  c What backup and disaster recovery measures that should be taken to
prevent this from happening

Supreet

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