I just stumbled upon the CBC’s Content Retention Policy. It says, in part:
In order to provide added value to its radio and television programs offering, CBC carries online elements of some of its radio and television programs. The purpose of online material retention is only to ease consultation by Internet users and not to set up nor to provide archives, unless when explicitly stated.
This is a shame, because to make the jump from “handy reference” to “valuable national news archive” would be so easy.
Compare this to the BBC’s description of its own website:
It launched in November 1997 and has since published approaching one and a half million full multi-media news pages, all but a handful of which are still available from the site’s search engine (top right of almost every page).