Replication of Data

Hi,

On my company’s network I have sbs 2003 server which is a DC, DHCP and Exchange server. I want to install a additional DC with in the same domin and I want to replicate all the data, shared folders on additional DC so that if my mail DC goes down users automatically be shifted to new DC and can excess the data. My question is can it be possible and how to implement.

Hope to hear from you expert guys soon.