[bombcar]

Wayback machine removes archives upon request, so there’s definitely stuff they don’t make publicly available (they may still have it).

[super256]

You don't even need to do requests if you are the owner of the URL. Robot.txt changes are applied in retrospect, which means you can disallow crawls to /abc, request a re-crawl, and all snapshots from the past which match this new rule will be removed.