Here's a video by NetBootCamp about different web page preservation techniques and the pro's and con's of each technique.
Web page preservation is a common task. Choosing how to do it is one of the most important aspects of this task. In this post, we’ll look at two different methods, and test drive tools used for each: Screenshots and Web Archives.
Read more ... Screenshots and WARC files.
For coverage regarding WebPreserver start at the 4:45 mark.