Header set X-Robots-Tag "noindex, nofollow, noarchive, nositelinkssearchbox, nosnippet, notranslate, noimageindex"
Of course, only the beeping Internet Archive totally ignored it and scraped my site. And now, despite me trying many times, they won't remove it.
It seems to mostly work, I also have Anubis in front of it now to keep the scrapers at bay.
(It's a personal diary website, started in 2000 before the term "blog" existed [EDIT: Not true - see below comment]. I know it's public content, I just don't want it searchable public)