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			everything you need, apart from the program itself is in 2 locations:
 on my PC they are
 C:\Users\....\AppData\Roaming\calibre
 C:\Users\...\Documents\Calibre Library
 
 backup all of those 2 folders.
 
 app data has your GUI settings, conversion preferences.....
 
 library has your books & metatdata.
 
 I think app data also has your plug ins but that they have to be re-installed on the back up PC - they don't transfer automatically.
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