So how do you write fire-and-forget systems? Typewriters can't become hopelessly insecure by leaving the typewriter sit on a shelf for a year. On the other hand

So how do you write fire-and-forget systems? Typewriters can't become hopelessly insecure by leaving the typewriter sit on a shelf for a year. On the other hand, you can't leave a Linux box unattended for more than a couple months before it's hopelessly insecure. Is the solution unikernels, or what? I think we'll have to find ways to make software that stands the passage of time a bit more. I feel like it's really hard to build software that survives on its own for even a tiny bit of time. Are we in an era that will leave no usable artifact behind?