Bandwidth was my first concern years ago when I applied to be sysadmin in Antartica (Carlini base). The only thing that I wanted was a full backup of stackoverflow.
We do have Kiwix at the South Pole. Mostly relies on people remembering to bring down the latest dumps. I tried building a StackOverflow zimfile from source there, because I only had the raw files, but I could never get it to work.