If your intention is to have a local archive of an online site, yes.

In my use case, some content is only available for a short window. If I want to refer to it, the URL will not work. This happens to me a lot of Wikipedia where a referenced URL is no longer working (linkrot). We need to a better way to track previous versions or access 404 pages that were previously alive.

Definitely, sites and content become inaccessible all the time.

For instance, I back up all new videos of my favorite YouTubers in case they are taken down (e.g. in the case of a copyright claim).