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If somebody in another country mirrors my site - an exact copy no changes, just a different url - will or could this get my original site penalised. Two identical sites might look odd to Google.
I'm not sure if a mirror could increase or decrease traffic.
If the mirror is located at:
(this is the actual .format and directory format)
then robots.txt should be:
I have checked the format of the file with a validator, so I just need to check my interpretation.