Gotta agree that it's really darn confusing as to what this thing actually does. Seems like a pretty big project that some talented people have poured a lot of time into, but what am I getting into here?

Does it (1) download archived urls already on archive.org locally? or (2) spider websites I choose from scratch and save them locally (or on archive.org??)

Totally unclear. These are very different things. Want to install and try it but also a little wary given the opacity of explanation about the basic functionality and purpose of the tool!