For #4, Guix integrates with the Software Heritage archive[0] and will look there if the upstream server is unavailable. The CI servers also act like content-a

For #4, Guix integrates with the Software Heritage archive[0] and will look there if the upstream server is unavailable. The CI servers also act like content-addressed mirrors, so in practice you won't notice when the upstream disappears. [0] https://www.softwareheritage.org/ https://www.softwareheritage.org/