indyank - 5:05 am on May 23, 2011 (gmt 0)
Using noarchive doesn't necessarily mean that they don't have a cache of all our pages on their servers.It just means that they don't show a "cached" link to searchers.
Google wants everything stored on their servers. I am almost sure that every page of every site is stored on their servers even if you noindex them.
They don't even want their bots to be blocked by robots.txt and this is clear from what they said in recent times.They now ask you to deal with duplicate content in other ways.