The only way to get the files from the Library is to export them.
Why do you think it's necessary to do this? Can't you just 'Show Package Contents' on the Library and there the files are?
I had no idea how to access the files from the package, but after trying what you said i realize how simple it was. I really just want to make sure my photo's are well protected so I wanted to have them in multiple formats. However if they are all available through the library file, I guess I really don't need to back it up again.