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Raspberry Pis (and similar devices) already work great as low-power servers.

The big issue is the home server community being overly focused on creating "battle stations" that look cool and run 40 different Docker containers rather than simple low-power solutions.

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Pi doesn't work that great, power consumption is still several watts, too much for batteries to be cheap and compact if you want a day or two of backup, plus self hosting in general is very much enthusiasts only.

Android does what Docker does while remaining very low power, because it gives you one standard API level, rather than some minimal syscalls and you have to bring all your own libraries right in the container.

You can very quickly run up against resource constraints with a raspberry pi.

You can also run against resource constraints with a smartphone.

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