You will get some duplicates of Kevin Bacon's homepage but should be fine otherwise.

Also around 500 papers about number theory

It won't traverse across domains without an explicit argument, so it won't go too crazy. It also won't backtrack, so you won't end up with a complete copy of a blog if you've only bookmarked a single article. You can, of course, reduce the maxdepth to 1 pretty safely, if you don't think you'll need more than the specific bookmarked page.

I use that for programming language documentation - for example I'll hit the root page of Python's standard library documentation, and get everything I need locally.