Historical archive of package metadata

I'm working on a project (with @sangy) and am interested in changes to the list of AUR packages over time. I know that packages-meta-ext-v1.json.gz contains the information I need, and is updated every 5 minutes.

1. Is there any way to access historical versions of this file? I would love to be able to grab the metadata for a week.

2. If not, how much of a burden would it be for me to curl it every 5 minutes (for a week)?

   I know there's in-flight work to expose diffs, which would be perfect, but I'd be interested in grabbing this in the next couple weeks.

   Also, I know bandwidth is a concern. I'd respect etags, so hopefully that shaves some bandwidth off. It'd be 8 or 9 MB every 5 minutes for a week, so a little under 100 GB total. I could also use the Manjaro mirror if @philmmanjaro is okay with it.