After all, I am not sure whether we should create an official archive hosted on aur.archlinux.org or just refer to an "inofficial" archive like aur-mirror.git. As Doug already mentioned, I am currently on vacation. I will have to think of that (and possibly implement an archive) when I am back home. Meanwhile, other opinions are welcome.
If you plan to redirect broken Arch Wiki links to the archive, please make sure that it is obvious that these packages are abandoned. They are likely to break or be out-of-date for months.
It would be nice to have an official archive, some packages do not have a maintainer but still work fine, and even if they break in the future it is better to have a "broken" PKGBUILD to start with than have to start from scratch. Maybe the archive could be at aur3.archive.archlinux.org and have a big warning that packages there are not maintained at all. As for what to provide, I'd say use whatever requires less disk space. I suppose that a way to go back in time to previous versions (as possible with aur-mirror.git) is most probably not needed. -- Mauro Santos