In reply to The Lemming:
> I have a new question about my current NAS and any future NAS that I buy. At the moment my 2 disk NAS is set up in RAID 1 in case one of the disks goes boom. If I back my NAS up to a separate external hard drive, and keep my data on my desktop computer, is there really a need to use any form of RAID?
I asked this very same question on the forums relating to my NAS device and got the following reply.
The primary purpose of RAID is to acheive high availablity.
In other words, RIAD is there to minimize down time due to loss of access to the data.
The primary purpose of backup is to minimize chances of data loss, which RAID by itself cannot acheive.
In other words, if you don't use RAID on the primary storage location to minimize downtime, then there's no reason to use it on a backup storage location like a NAS.
The general 3 -2- 1 principal for data protection will include 3 copies of your data, 2 Physically discreat storage devices in your posession(RAID1 is still just 1 location), and 1 off-site(or in the cloud).
Adding redundancy to the backup device if you don't need it to expand your total storage will not, by itself accomplish the elmination of single points of failure like the 3-2-1 backup method will.
It would seem like I am slowly bumbling in the right direction with my thoughts on the purpose of RAID, and I very much would appreciate being put in the right.
Is RAID mainly for data that you actively use at the moment?
Is RAID a bit of overkill when a NAS device is primarily part of a back-up system where you have your data in several locations?
If the NAS was my primary source of getting to my data then I can see a need for RAID but I'm beginning to think that RAID is not required for backups and serving movies throughout the house.