This question is actually related to using the HP Proliant Microserver, but I guess that does not matter. As we know, a server, even with RAID is not to be treated as a backup as a server can fail. Your backup would naturally be hard drives, and to house the hard drives you need some kind of box, and the most simple and neat answer would be another HP Microserver. So, let's set the picture: We have 2 HP Microservers running FreeNAS of USD sticks. Both have four identical hard drives and both on the same Gigabit network. One of them is the one you actually write to yourself. Your Server let us say. What kind of setup would you need to have the second identical machine hold exact copies of all the data of the 1st machine? If you had a RaidZ1 setup on both then this would be ultra secure would it not? As if one drive in one machine went down, then no only would you have time to replace the dead drive, but also if the array did go down due to a second drive going, then you could always swap over and use the other machine. I guess you could always risk not having any raid on either as it's unlikely both machines would fail at the same time. Would the only way to have this working, say on Windows, would be to set up the exact same shares on both identical microservers and use something such as the Msoft powertoy to sync both servers. So as far as you are concerned you have free access to both machines. Or would it be better to have some automatic thing in place where one Microserver is set to backup to the other Microserver? I'm thinking of making an identical machine to the one I have just put together, and doing as I suggest above and wonder what your thoughts were.