Separate from the "current crisis" and retrospective contact-tracing: Are there any existing apps that keep a high-resolution trail of where you've been, witho

Separate from the "current crisis" and retrospective contact-tracing: Are there any existing apps that keep a high-resolution trail of where you've been, without ever uploading it to the cloud? (Or, only uploading it to a location you choose, encrypted to a key you hold?) Something like Google "Location History", but without Google or any other intermediary data-silos who could be compromised to reveal my data against my wishes.