What is the best practice when it comes to using RAID on a NAS, when that NAS is purely there to hold server backups?
My intuition tells me to forego RAID and just use a single drive. Reasons why:
- Cheaper on Hardware
- Better performance
- Simpler. One less level of complexity = fewer things to go wrong / fewer things to monitor
- Longer Drive Life (no raid integrity checks, synchronizations, and no heat from a second drive)
- Any benefits of going RAID would be negated by a 2-drive failure anyhow.
Here's the reasons against that I can think of ...
- local and offsite backups would be interrupted - everything since last backup would not be backed up.
- would need to recreate the storage pools and volumes, and reconfigure the backup software so it could sync with the offsite. Potential problems / complexity with that.
- Labour is the most expensive component ...
Specifics of implementation: Server 2019 - Drives are protected with RAID Replicating from Server to NAS NAS will be replicating to Backblaze B2 6TB Ironwolf Pro Drives in the NAS ...
If software like Veeam was involved - I'd definitely go RAID because you don't want to interrupt the synthetic fulls / replication chains .. but this is a smaller office .. so I'm left weighing it out.
What's the best practice for these scenarios? Do you really need redundancy on your redundancy?