If you want google's cache of your site to remain unchanged is it a good idea to add noarchive to robots.txt? Or will this wipe out your caches?
migrated from serverfault.com Dec 18 '11 at 19:27
Firstly, there is no such thing as noarchive in robots.txt. You need to add a meta tag to all pages on which you wish to prevent caching:
When you have done that, then Google will stop caching the page entirely and won't show a cache link at all. There is no way to keep showing the old cache while preventing new caches.