network setup

hi i searching for a couple of answers.
i want to set up a network for a company wich will work mostly like a terminal server were the user log on to there pc but all work that are done on the workstations are save to the server automatically and back up to another backup server.so what i mean is that i dont want any data save on the users pc at all and there account will expired after some time for security reason.so they wont be able to have access to the data on there pc when log of the server.and i want the server to be running win server 2008. in what way can i do this? thanx.