Google's cache only last a handful of days. It's very useful if the Website
is down temporarily (for maintenance or overload for example) but totally
useless otherwise.
Kind Regards, Dodoïste
2010/8/24 theo10011 <de10011(a)gmail.com>
Its a great idea, using the wayback machine to ward of
link rot. I support
it but doesn't Google cache offer a similar service. there is also
deadURL.com which uses Google Cache, the Internet Archive, and user
submissions for gathering dead links.
I would guess that Google Cache would have the highest and the longest
reliability, at least as long as Google exists, its their business.
Regards
Theo