Airgapped. It really makes threat modelling so so soooo much easier. It's temporal so if I were being attacked by a state level actor exfiltration is possible but this specific application I either have the data live and no internet, or internet and no data. I also have some lesser stuff that I allow on-prem w/ internet and just trust the firewall, but absolutely no way am I doing any sensitive data storage or inference in the cloud.

Since people will be curious, one lesser thing I used this for is a diary/assistant and it's nice to have the peace of mind that I can dump my inner most thoughts without any concern for oversharing.

What kind of hardware do you need for this setup?

A computer with a couple gaming GPUs, a lan cable you can unplug and an encrypted external hard drive to offline your sensitive data.

totally agree that air-gapped provides unparalleled peace of mind. That's a major reason why we have strong support for local deployment. Nice to know that our hypothesis is somewhat accurate :)