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Should I bother with raid (self.selfhosted)

submitted 2 days ago by Dust0741 to c/selfhosted

36 comments fedilink hide all child comments

I have a 2 bay NAS, and I was planning on using 2x 18tb HDDs in raid 1. I was planning on purchasing 3 of these drives so when one fails I have the replacement. (I am aware that you should purchase at different times to reduce risk of them all failing at the same time)

Then I setup restic.

It makes backups so easy that I am wondering if I should even bother with raid.

Currently I have ~1TB of backups, and with restics snapshots, it won't grow to be that big anyways.

Either way, I will be storing the backups in aws S3. So is it still worth it to use raid? (I also will be storing backups at my parents)

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[–] [email protected] 30 points 2 days ago* (last edited 2 days ago) (1 children)

I always do some level of RAID. If for no other reason, I'm not out of commission if a disk fails. When you're working with multi TB, restoring from a backup can take a while. If rapid recovery from a disk failure is not a high priority for you, then you could probably do without RAID.

Either way, make sure you test your backups occasionally.

Another way to put it: With RAID, a disk failure is like your Check Engine light coming on. You can still drive, but you should address the problem as soon as you can. Without RAID, it's like your engine has seized up and you have to tow it for repair and are without your car until it's fixed.

[–] Dust0741 6 points 2 days ago

Hmm that's a good point.

Aws also can cost a good chunk if you restore un-optimally