Can I run my TrueNAS apps off of just one NVMe? Or should I really mirror them?

[QuestionAsker]

Building my first TrueNAS and was going to get 1 x open box / used 1.92TB Samsung PM9A3 NVMe, to run my apps off of.

Questions:

1. Should I really mirror my app NVMe's, and get two?

2. How big capacity NVMe should I get, based on my uses? (Shown below)

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The apps I would run:

• Immich (I have like 2 - 4TB of photos, and a few TB of videos. I will be doing video editing)
• Nextcloud
• Jellyfin (Maybe will have a few hundred movies. I don't watch many movies, just archive older / hard to find movies, for when I do watch them, maybe once a month).
• Maybe a few other apps I haven't though of yet

In my home ecosystem I will also be running:

• a powerful desktop workstation
• a homelab server (i7-8700T w/ 64GB RAM and 256gb + 1tb NVMe)

 

[romainB]

You can run TrueNAS apps off a single NVMe for speed, but mirroring them is highly recommended for redundancy to avoid downtime and data loss if that single drive fails, which is crucial for anything beyond non-essential services; consider a mirrored SSD/NVMe pool for apps/VMs and a separate large pool for media.

 

[QuestionAsker]

You can run TrueNAS apps off a single NVMe for speed, but mirroring them is highly recommended for redundancy to avoid downtime and data loss if that single drive fails, which is crucial for anything beyond non-essential services; consider a mirrored SSD/NVMe pool for apps/VMs and a separate large pool for media.

Thank you.

What if I backed up a copy / mirror on my HDD vdev pool?

Or would that be much more complicated than just having a 2nd mirrored NVMe drive, to restore?

(I'm only looking to run a few services at first... not sure if I should get a 2nd NVMe as a mirror from the start... or add one down the line?)