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#11
Here is the authoritative statement from license.rtf which you can find in Windows/System32.
10. BACKUP COPY.
a. Media. If you acquired the software on a disc or other media, you may make one backup copy of the media. You may use it only to reinstall the software on the licensed computer.
b. Electronic Download. If you purchased and downloaded the software online, you may make one copy of the software on a disc or other media in order to install the software on a computer. You may also use it to reinstall the software on the licensed computer.