Where does all the data get saved?

Where does all the data get saved?

Hi

I am wondering where does all the emails and data get saved off this software? Is it hosted somewhere or on the computer? As I was hoping to find somthing that when i get emails etc and do calender etc it get saved on a server. So if Comp gets nicked or breakdown I be on the save side by just installing software and getting everything back off the hosted server on the web.

Cheers