It's poor system design, if you have multiple copies of the same song.
In my Audiovault (designed by me, not a prebuilt from BE), I use two File Servers. There are no audio cards in the servers. Simply file access. All workstations boot and run from an Intel SSD and mount both servers for audio.
All stations have access to all files, immediately. If I take server A offline, everyone goes to B... Even in the middle of a cut, there is no audio drop. The only disadvantage to this approach is if I lose my Network Switch, the stations will go down.
I find this approach much easier to manage than scanning and copying files to every single workstation. There is no wait for a file to transfer and it is very easy for me to do cleanup, etc...
It's a personal preference, but I like organized, clean file systems. It would drive me crazy to have multiple copies of the same audio in the system.