The problem with that though is that people will think you've manipulated your copy. I've had people accuse me of this when I save pages with screenshots. You need to have a trusted third party make and store the copies.
Sometimes I use archive.is , they don't automatically delete because of robots.txt but it's not fully clear to me when they do delete things.
Sometimes I use archive.is , they don't automatically delete because of robots.txt but it's not fully clear to me when they do delete things.