I was also amazed by solar version of low tech magazine. After reading that, we kind of started a crowdfunding there for solar powered email servers: https://ecoho.st (sorry in French).
We didn’t put that much energy yet, but I have to admit it changed a bit my vision on what I want to bring to people with indie.host.
I want to use this project for experimentation with business models (donation based), static hosting and what I’d call radical low tech (like shutting down email server at night.
Thinking about it, there are 2 parts to optimise, the client and the server.
On the server side, we should use compiled language, of course, and static HTML wherever possible. Avoid heavy css and js ( also for the client) use better compression (video, image, text).
On the client, maybe syncing 3 times a day is enough, no more push notifications (which are damaging our brains anyway).
You also realize that CLIs are better than UIs. Take git for instance
The most complicated part is for the user to be more “frugal” I’d say, to be less instant. Is a pad really good for environment, is it really necessary to collaborate that instantly? (I love codimd and chats).
Backups are also good candidate to be running on solar powered servers, you usually need them only once a day.
About data replication, for me, it is always like, I’ll add one more redundancy to spare my time. For instance, for backups, I could have just one disk. But when this disk fails, it is annoying, I have to resetup everything…
So yes, I’m definitely interested in this field