I don't know about Canadia, but in the US, pages archived by the Internet Archive Wayback Machine have been ruled to be
admissible as evidence by a federal appeals court. However, that ruling was based on the fact that the office manager of the Internet Archive testified as to the workings of the site and affirmed that every archived page was a true and
honest accurate representation of the page as it appeared when crawled by the Archive at the specified time. A BC prosecutor might be able to get archive.org pages admitted on that basis alone, although archive.li or whatever it's calling itself now might be trickier.
Tl;dr, submit everything to the Wayback Machine in addition to whatever else you do.