Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Not an answer, but I’m curious: what's wrong with just having several ssh keys, one per device?
The primary issue is I don't always access devices from only those 3 systems. If I'm traveling or I wipe my device or get a new one, I would have to add the new key to many servers as authorized keys, and I'd need to have password access enabled in order to add the keys in the first place. Also, I want a key backed up in case of disaster since all of my devices are in my home most of the time. A few people use these systems, but only I maintain them.
You can back up ~/.ssh though, and restore it on any system.
In fact, that's generally what you want to do, since if one device gets lost or compromised, you just revoke access to the key for that device.