Creating a copy of the library in Endnote X3

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Hello,

I am using Endnote X3. I am having around 1700 references in my library. I have attachments in  around 1400 references (pdf attachment).

I am trying to create a copy of my library to be on the safer side but somehow i couldnt create one. 

I tried in two ways.

  1. I just made a copy of my original library and tried to open it but it says the file is damaged, if i use the recovery tool it recovers 0 references.

  2. I tried to copy all the references to a new library but only  around 300 references move to the new library.

Anybody has any answer for how to make a copy of my library?