In a case that we write some papers, we usually keep a bibtex file in the folder of working space. Therefore, we have to manage some files of bibtex. However, I think that the best way is managing of a single bibtex file.
Then, we suppose that a function of `mirroring'.
Firstly, we make a bibtex file which become a `base file'. Secondly, we open the file by JabRef. Then, we can specify pathes or filenames which are mirrored bibtex files. After we editted the base file, if we save the file, then JabRef automatically copy it into the pathes and files which is specified.
This software is great useful. I really appreciate it.