How exactly does the Wayback Machine know (decide?) which webpages to scan and at what times? Why are some pages archived while others not (excluding those with things like personal info, etc…)?
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The Wayback Machine does not scan pages itself. People go along and enter a URL for the Wayback Machine to archive. Wikipedia editors, for instance, will sometimes use the Wayback Machine if they want to cite a webpage as a source but they suspect that webpage will not stay up for a very long.
You can enter a URL into the site and see if it has been archived. And you can also make an archive version of that page yourself.
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