As for now, Archive.is appears to be down. It has also come to our attention that the website is blocked in many countries for various reasons.
Because we are an educational website and need to cite sources, we often want to use a screenshot of a source for consistency. For this we turned to archive.is.
While we are currently working to change links to Archive.org, it is always possible that we will miss a link or two.
You you find such a problem, feel free to use the Contact Page to let us know.