The Wayback Machine is helpful, but sometimes I want a local copy of a webpage.
That is the reason I occasionaly use the browser extension 'Mozilla Archive Format'.
http://maf.mozdev.org/ Changing the
internal settings, notably 'keepscripts' set to 'true', the saved webpage has some functioning scripts.
'Read more' is clickable, screenshots are clickable, and first three pages of reviews are available. Some graphics are missing though that are present with the 'keepscripts' set to 'false'.
'Mozilla Archive Format' lists one of the features as being able to save videos on the page, but so far I have not been able to do this.
There are a few things I would change if I had the coding knowledge, but still I am glad this extension exists.