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http://www.adobe.com/products/eulas/pdfs/Gen_WWCombined-comb ined-20080623_1026.pdf
Take a look at section 2.6 for the backup copy answer.
For laptop installations, see section 2.4
Sorry for the inconvience, but this document has many different country versions within the PDF document. Users should go to the appropriate section to review. The UK portion of the pdf begins on about pg 109 of the pdf, while the US version begins on about pg 123.