Hi, I have the ability now to buy some computer backup systems for the office now and I would like a professional opinion. I hope to be able to purchase the top-of-the-line model for the office. I am looking for the fastest backup possible. I do not have a lot of latent time to sit around and wait for the backup. I cannot wait a day or even two hours. Which is the model that would best suit me? I guess I should also tell you that I need 250 GB of storage. I do not even need that, but better safe than sorry, right? Thanks –Kim