Restrict BESDownloadCacher by date?

I am running an air-gapped system and are trying to use the Downloadcacher to pull a bunch of BES Sites. I really do not want to have to pull everything for something like BES Support which has all the 8.x versions of the software.

is there a way to restrict either a download site, or restrict the download cacher to only pull content from a specific date forward?

Thanks,
Lou