Taylor and Amy Experiment With an Open Source, Decentralised, Encrypted Way to Message Complete Strangers

It does configuration by WebUSB to download the firmware onto the modules, but I'm sure that's all encrypted too. See Ian Clarke Answering Questions About Freenet and Wi-Wi 900 MHz Radio-synced Oscillators so that you can use a distributed computation to authenticate messages. See Ian Clarke on Freenet. 

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Tomaz has made a 10Gb/s router and fiber optic cable is pretty cheap: from 10 cents per meter. So you are all set to help each other with offsite backups now: see

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