How to protect yourself from the ubiquitous Google cache?

Question

Google

Actually, the question itself has been voiced, but I would like to clarify, for example, there is an article on Habré, in one of the closed blogs, but if you enter it correctly in the Google cache search, then it comes out even to an unregistered person on Habré.
Are there any means to completely hide from cache systems? And how long is the cache usually stored in tyrnet?
Grand Mercy!

Answer 1

I wonder how it gets there if it is not available to the unregistered.

Answer 2

If you haven’t got into the cache yet, a properly configured robots.txt will help (already written), for example, like this: if one of your sites, despite all the precautions, ended up in the cache, then here (http://www. google.com/webmasters/), after a simple domain authorization procedure, you can send a request to Google to remove a specific page or page pool from the cache. Before that, after setting up robots.txt. Recently, I personally cut out a dozen sites from Google. This is if in general. Regarding habr - the devil knows them. Maybe deliberately opened, to increase in the issuance.
User-agent: *
Disallow: /

Answer 3

Google and Yandex (not aware of the rest) do not cache pages with
<meta name="robots" content="noarchive">

Answer 4

During the Habr upgrade, there were moments when all articles became available without registration. Perhaps Google ate them at that time.