Originally Posted by Lady Fitzgerald
Actually, there are scenarios where RAIDs are justified in a backup set. If you are backing up a RAID inside the computer that is too large to backup to a single drive, a pair of external RAIDs would be necessary to get the volume sizes needed. Because of that difficulty in backing up a RAID, I do not recommend using RAID in a computer unless continuous, uninterrupted operation is essential (or is highly desirable).
Maybe I am misunderstanding what you are saying but I don't believe this is true. If you have a RAID inside your computer and it is too big to fit on one device, almost every backup solution available has the ability to spread the backup across multiple devices. In any case, RAIDing the backup doesn't change anything.
Imagine a scenario, we have a 5TB hard drive or whatever in our computer. For whatever reason we decide we need 24/7 uptime, so we add a second 5TB drive and mirror them. We still only have 5TB of data to backup (and in fact, with data deduplication in place maybe less). So we backup one of the drives, and for simplicity's sake we just do a straight copy. We don't need to mirror our backups together because there is no need for redundancy; the backup isn't going to be online anyway. If for whatever reason we decide we want to be extra safe and keep two copies, that is fine, but we would want those copies to be separate in separate locations and not RAIDed together. There is simply no advantage to raiding them.