Backup files in hidden mode

To Whom It May Concern: We are looking for a talented and professional programmer to create a program that allow us to backup in hidden mode some specific office files (.xls .doc .pdf .ppt) to a pen drive. When the pen drive is inserted in the computer the program will backup and send all files with these extensions to the pen. Simultaneously must open a ppt file or excel file. The aim is to control workers in different departments and locations, but they mustn’t have that knowledge. The program must not be detected by the worker, or by programs like antivirus, firewall and others. We have local access to these computers. Best regards,