Data redundancy, simply put is having the same data replicated in two places. There’s more to it than that but for a rudimentary understanding it is one way to think about it. Data redundancy is not the same as a backup. A backup is a “snapshot” of your data at a particular time, whereas redundant data is literally the same data - hence why it is referred to as redundant. If you have your own backup solution such as a Network-Attached Storage (NAS) device, then it is a good idea to have at least two disks installed and mirrored. This way if something happens to one disk, if it fails for whatever reason, you have the other disk with the same data on it. If your NAS supports hot swapping, you can simply purchase another hard drive (of the same size and speed) and replace the failed drive. The NAS will copy the data to the new drive and your redundant array will be back up once it is done without skipping a beat. There are numerous ways in which you can implement data redundancy, which will be covered in future posts.
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