Locking down Network Share of Printout/PR

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Hi all, I have a question, whenever our PR user does anything, it creates a printout to the Printout/PR folder in case the system ever goes down and a backup doesn't work. The question is, how does it write to that network share? Does it just use the windows credentials of the user, or is it more indepth? I ask, as technically someone could go into that folder who doesn't need to see payroll, could open the .prn file and see what people are paid, or what checks have been inputted. Any help would greatly be appreciated. Thank you.