It's much more expensive that that my friend. Its hardware, software and a protocol. If the device fails, there are multiple backups kept that can easily restore it. It never connects to the internet.

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So, let's say $750 for a basic Linux SBC + enclosure (from some reverse searching), some software and a "protocol" that is bound to a specific device? Compared to using Tails (which also does not connect to the internet) + existing things like Miniscript, Shamir Secret Sharing, etc, what is the benefit?