Retrieving a Website from Google Cache

(google search) -> site:[domain]
e.g.  site:tutorials.jenkov.com
@reference_1_techattitude.com
How to download pages of a site from Google Cache

http://webcache.googleusercontent.com/search?q=cache:[domain]
e.g. http://webcache.googleusercontent.com/search?q=cache:tutorials.jenkov.com
@reference_2_cachedview.com
CachedView.com
The Google Cache Browser for any page on Internet.

You can see what Google (still) knows about a website by using a site restrict:

http://www.google.com/search?q=site:[domain]

You might also check out the Internet Archive.
(In either case, you’d probably want to do some heavy-duty automating to fetch thousands of pages.)

@reference_3_stackoverflow
Retrieving an entire website using Google Cache?

@reference_4_guyrutenberg.com
Retrieving Google’s Cache for a Whole Website