I don't know of any mirrors that are "official", but I do know some people maintain mirrors via rsync
(rsync
service on elpa.gnu.org
was added specifically in response to such requests, IIRC to maintain a mirror on the other side of China's firewall).
As for validation, (Non)GNU ELPA signs all the packages and the archive-contents
file (with a key distributed alongside Emacs), so it should "just work".
this post was submitted on 27 Sep 2025
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