Precisely. Kiwix has a search and browse function. Just sort by file size to get the biggest groups of data.

Replying to my own reply.

I keep a couple of thumb drives with both a Kiwix installer and a full backup of some select downloads.

Kiwix.org

Download the App, and you can then download a full backup of Wikipedia, PHP Manuals, the “Survival Library”, Ted Talks, FEMA guides, etc.

This exactly!