@eladhen my advice would be to point the Wayback Machine at it
@eladhen https://archive.org/web/
Basically, Archive.org keeps a permanent record of many sites on the Internet, and you can send them a URL and they'll add the site to their list.
However, if what you need is a total scrape of the site (all pages), you will be better off using http://www.httrack.com/ or a cURL script.
I suggest Archive.org mainly because 1) it's a well-known and highly trusted organization, reducing possible doubt about the accuracy of the backup and 2) it's easy.
@tindall
The fact that this site is taken down is a blessing. I don't want it to be publicly available.
@tindall
What's that?