Quote:
Originally Posted by book64
Really sorry but what does that mean? lol 
And will it save my columns Add ons etc?
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Columns will be stored together with the library, plugins are part of calibre's Application Data.
If you backup both, as BetterRed's link explains, then yes, everything will be saved.
If you're not sure what "that" means, you will have to tell us which particular "that" is giving you a problem.