Hi, thanks for your replies. I am very sorry,, I was out.
My environment is an small one. There is only two users, I need to configure a environment where it be easy to replace the server when a disaster take place. Hypervisor, USB boot and NAS might be the solution. I've bought the NAS. I'm aware is not supported in Esxi 5.0 now, I was not sure, but I have read it runs correctly. It a cheap solution for a small enviornment.
If I have any news, I will post here.
See you.