filetype:bak (inurl:php | inurl:asp | inurl:rb)

Google dork Description: filetype:bak (inurl:php | inurl:asp | inurl:rb)
Google search: filetype:bak (inurl:php | inurl:asp | inurl:rb)
Submited: 2013-11-25
This one could be used to find all sorts of backup data, but this example
is limited to just common webapp extensions

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