Comment Wayback Machine Exclusion is Permanent (Score 2) 101
If you add a deny all robots.txt, the domain will be permanently excluded from the archive.org wayback machine, regardless of if you change it to allow later.
Currently there is no way to exclude only a portion of a site, or to exclude archiving a site for a particular time period only.
When a URL has been excluded at direct owner request from being archived, that exclusion is retroactive and permanent.