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You may be confused about the terminology:
RAID = many disks that help prevent data loss
NVME = Just an SSD
A collection of drives that are joined to a RAID group prevent data loss. An NVME drive is just a drive, which has no data loss prevention. If that drive dies, the data dies.
If those docs say anything about SSD, it's because their code is slow, and it will seem less obvious by using a faster disk.
I understand all of that. Sorry I didn't explain it well.
I have a RAID6 for data and a single HDD for system files. I'd like to move the HDD to an NVME/SSD. I suppose I could make another RAID with an additional NVME, but I've found it easier to deal with booting off a traditional drive.
My solution for redundancy for the NVME is to just backup the bits that I need every night. These are usually just a few hundred megabyte database files. I'm curious if that's a typical solution.
edit: to clarify, it's a software raid with mdadm.
I just made a mirror out of two NVMes―they got cheap enough not to bother too much with the loss of capacity. Of course, that limits what I can put there, so I use a bit of a tiered storage between my NVMe and HDD pools.
Just think in terms of data loss: are you going to be ok if you lost the data between backups? If the answer is yes, one NVMe is enough.
Yeah, I'm only serving one timezone, so if I can swing nightly backups at periods of low activity, I'd only be out 1 day which isn't that big.