That may be true, but a well-planned filing system will deliver better results without the enormous waste of space involved in the duplicate filing method. Too many filing places in too many parts of your office. Files disordered, without any apparent plan or arrangement. Related records are filed under different titles. Too much time is spent looking for files.
Drawers are jammed with folders.
Some of your folders are bulging with papers. Labels on files are difficult to read. Some folders slump out of sight. Old, obsolete records are still in active files. Decisions about where to file are left to each file clerk.