packages.vyos.net now supports rsync to simplify mirroring.
Although you probably should refrain from mirroring it until repository layout is finalized, as there may be huge changes in directory layout soon. Or at least be ready for those changes.
I think we should replace the original layout (one repo per branch) with more debian-like (single repo, different distributions, stable/unstable suits). I’m going to try it this weekend in a separate directory, stay tuned.