Is RAID 5 + Spare preferable to simple RAID 5? I understand that my storage space with four 4TB HD is reduced from approx 12TB to approx 9TB. But my understanding is that I have the capability for a “hot spare” with RAID 5 + Spare and that I do not have a hot spare with simple RAID 5. I also think I understand that simple RAID 5 is potentially problematic when one drive fails in that there is a finite risk of other drive failures when a failed drive is replaced and the array re-builds itself.
Do I have it correctly? BTW, I am backing my array up to Elephant Drive. If storage space is not an issue, i.e., 9TB is sufficient for current and intermediate term requirements, is RAID 5 + Spare a better configuration?
Before I go too much further with populating My Cloud. I would prefer, if generally recommended, to re-configure now with a small amount of data than later with a much larger amount.