this post was submitted on 09 Mar 2025
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I am not sure how two synced HA instances (if that's even possible) would help. You would need to allow your IoT devices to be accessible by the Home Assistant instance you want to use with your personal devices. If that seems like a risk to you, then why not run HA in the DMZ alltogether?
You can configure HA to use an external database, so you could (presumably) config two instances to use the same DB. Not sure how much conflict that would cause for entities that are only attached to one of those instances, but it seems like both should have the same access to state data and history. Could probably even set one instance up with read-only DB access to limit data conflicts, although I imagine HA will complain about that.
Even with an external database, HA still uses its internal DB for some things, so I don't think you'd ever get identically mirrored instances.