How much would it cost you if your server failed today? How many employees would you have to pay hourly wages while they wait for their data to be available? If you sell goods, how many customers wouldn't get their orders taken or be able to schedule service with you, if your server is unavailable? How many customers wouldn't get their orders shipped because you don't know what they ordered or even who to call because all that information is on your server? If you’re a doctor’s office, will you know which patients are coming in and what their history is? Can you afford to NOT replace your server before it fails?
Does your server hardware need to be replaced? The older your hardware is, the more likely it is to fail and cause a loss of productivity.