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Some websites are excluded from the Wayback Machine for several reasons:

Password-Protected Pages: Sites that require a password to access are not archived.

Form-Based Navigation: Pages that are only accessible by typing into and submitting a form are excluded.

Secure Servers: Pages on secure servers (HTTPS) may not be archived.

Robots Exclusions: Websites can use a robots.txt file to instruct web crawlers not to archive certain parts of the site.

Direct Requests: Some site owners request that their sites be excluded from the Wayback Machine.

These exclusions help ensure that the Wayback Machine respects the privacy and security measures of individual websites.

Does this help clarify why some sites might be missing from the archive?