User-agent: dotbot 
Disallow: /

User-agent: * 
Disallow: /administrator/
Disallow: /cache/
Disallow: /components/
Disallow: /editor/
Disallow: /help/
Disallow: /images/
Disallow: /includes/
Disallow: /language/
Disallow: /mambots/
Disallow: /media/
Disallow: /modules/
Disallow: /templates/
Disallow: /installation/

# note to site owner from server admins:
# we noticed a large spike in MySQL traffic foryour site, and checking the
# logs it seems that the DotBot spider is ignoring your robots.txt file and
# spidering your complete site
#
# I've added the lines above, but you may want to think about using a
# .htaccess file to clock their IP (208.115.111.251)