I have, almost in a panic, realised that I have some hard drives that need to be replaced as they are 6 years old. Although I have had no issues with them I thought replace them before they fail. It still seems a shame that a working hard drive has to be scrapped as it is old so I thought why not set up a RAID 1 and use the drives as an addition to the new drive. The logic being that when one disk fails the other drive in the RAID will have the data safe. I plan to have a main drive and two other drives in a RAID 1 and another drive for backup.