Well the old approach with mirrors.manjaro.org was, that we had a copy of the repositories on a CDN77 storage solution and then the nodes would download and cache from there.
With the new approach on mirrors2.manjaro.org we use the Origin server of Manjaro Packages as direct source. So now the data center nodes get the files directly from the Origin server and cache them. Since some files like DBs have the same name, we have to purge them regularly from the nodes, so not outdated files get downloaded at the users end. The purge we had to do also with the old approach, so no changes there. We can however vary the time slots. Currently every 10 minutes the DBs get purged.
We already have migrated the AUR DB, which we now also source directly from Arch to the new approach.