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I’m suprised the family didn’t have UPS & generator at their house when a member’s life depends on a running machine. It’s not like many people built batteries in their homes just to store their solar energy. I highly doubt that a BYD is cheaper than a generator.
chezmoi.io is one of the best dotfile managers available. Great template language if you need different, many ways to distribute secrets safely, merging works well even with templates, not limited to homedir.