Does anyone know the website that allows you to submit your blog/website, and it is 'kept' forever for future generations? Thanks in advance,

XenoSapien

It's the Wayback Machine (http://www.archive.org/index.php); sites are added when they're crawled by Alexa. To make sure your website gets crawled, see the first FAQ entry on this page (http://www.archive.org/about/faqs.php).

Vasily

I use HTTracker to keep a local copy of any website: HTTracker download from Browsers category (http://www.sofotex.com/HTTracker-download_L28853.html)