Excel networking help needed for backup

[Scilin]

Im working on setting our database up for booking different business related
things
and have run into an issue with excel i have the network running and
updating everything fine however i need to auto config a backup thats saved
to a different directory that can only be accessed via admin to make it the
master copy that cannot be tampered with while retaining the open excel
network so the sales personnel can access the info i also do not wish to use
access just excel.

any help is much appreciated
Scilin