I am getting worried these days about the volatility of URLs and web pages. I guess you all know the problem: it is very easy to create a web page, and hence many people do so. Great! However, after some years, only few of those web pages are still available. Common reasons include people retiring, or moving to other places, and therefore their web pages at their employer’s site disappear. Similarly, registering a domain name at some point in time does not mean you will keep on paying the yearly fees forever. Or also, web sites getting an entire re-design often result in broken URLs.
Why does this worry me so much?