[mamcx]

You need to answer this from many directions:

* Hardware * Network * Storage * Electricity

Before go to software, because if the hardware break then what?

After it, you need an OS where you can be certain don't depend on the cloud or phone home ever, then after that you probably need a decent set of:

* Solid programing lang: Like Rust * Or very barebones: Like C * A RDBMS like sqlite

Set of tooling like code editor, image, etc