EndNote library shared by multiple users without reference duplication

I didn’t realize opening a shared library copied it to the local hard drive, but it does work pretty efficiently, so I guess I am not surprised. Will have to explore whether it can be access it when I am off line?  Do you know where it is “saved”? 

The Developers don’t like it, but for 20 years, we have kept two libraries (with very different purposes) on our shared network drive and using a script, they (both the .enl and the .DATA folder) are copied every night to to a read only drive, and everyone uses the read only copy.  The Network drive is religiously backed up as well, and we can easily retrieve an earlier version up to a month or so, if something catostrophic did happen to them. There aren’t that many of us though, and we make sure that we communicate when we want to open the read/write copy and make sure we close it when we are finished. When open, other users get an error message, advising them someone has it open (but unfortunately not who has it open).  At work, we have very fast network connections, so it has never been a problem. Currently with many of us working from home, we do use the shared library functionality though.