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Advice for tiny NAS to store backups?

My backup game is pretty bad, I only have my primary copy of my data and a cloud storage copy. I was trying to think of a cheap way to have another backup, and then realized I have an Orange Pi Zero 2 and a 1TB USD SSD lying around. So I was thinking of:

  • installing Debian on the OPZ2, and setting up key-authenticated SFTP (no password auth)
  • connect the OPZ2 on my home network and expose a non-standard (e.g. not 22) port for SFTP
  • have a subdomain point to my home network ip, and use DDNS to keep it in sync
  • using Restic to remotely push password-encrypted backups to the OPZ2 via SFTP using the subdomain
  • set a cron job to check diskhealth and send myself email on bad
  • enable auto updates on debian and email on fail

Is this setup a bad idea? Is this a security nightmare? Any better suggestions?

BCsven ,

Syncthing

bladewdr ,

If you’ve got a copy of the data that’s local, why are you opening up ports? Just run the backup job internally.

I’m also not fond of using SBCs as a NAS, by nature their I/O is extremely limited. It will probably work as a backup, but man do I not trust a USB interface at all.

I also recommend not relying on email for notifications - too unreliable. I use the healthchecks.io docker image and have it send me notifications via Pushover when something fails.

jakkos OP ,

If you’ve got a copy of the data that’s local, why are you opening up ports? Just run the backup job internally.

I’m often not at home for weeks at a time.

but man do I not trust a USB interface at all.

Trust?

I also recommend not relying on email for notifications - too unreliable. I use the healthchecks.io docker image and have it send me notifications via Pushover when something fails.

I’ll look into this thanks!

bladewdr ,

You don’t need to be home for a cron job to run.

USB has a bad habit of randomly dropping off the bus until you reseat the cable or reset the device.

tux0r ,

A few thoughts on this:

  • Debian is, in my opinion, oversized for an OPZ2. If it absolutely has to be Linux (does it?), Alpine or Void might be worth a closer look.
  • Why SFTP? Wouldn’t SCP be enough?
  • Automatic updates are risky for a device that is supposed to run always. Instead, I would recommend sending update notifications and then manually applying an update from time to time. If the device no longer boots up, you often don’t even notice it.
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