try below code to place a file into your network drive.

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/// ******** copy logic
java.io.InputStream in=null;
java.io.OutputStream out=null;

//CCFFilePath param. comes from the cc file generation logic.
String xFileSource = tools.getParamValue("CCFFilePath"); 
//String xFileSource = "/usr/pega/temp/PCS/pcs7devb_temp/StaticContent/global/ServiceExport/ODSCreditableCoverageFile.xls";
//String xFileDestination = "/PCS7_DEVB_DRUG_FACETSRx/TestCCFile6.xlsx";
String xFileDestination = pega_rules_utilities.getDataSystemSetting("PCSFW", "CC/RDrivePath")+pega_rules_utilities.getDataSystemSetting("PCSFW", "CCFFileName");

oLog.infoForced("\n files - to move  "+ xFileSource+  " --->  "+ xFileDestination );
java.io.File xlFileOld = new java.io.File(xFileSource);
java.io.File xFileDest = new java.io.File(xFileDestination );
if(xlFileOld.canRead()){oLog.info("Can Read the file from source dir (unix temp dir)");}else oLog.error("\n ** Can't Read from temp : (no read access)");
//if(xFileDest.canWrite()){oLog.info("Can Write the file to R: drive");}else oLog.error("\n ** Can't write to R: (No write access)");

try{
    in = new java.io.FileInputStream(xlFileOld);
    oLog.info(" successfully OPEN The IN stream.. " );
    out = new java.io.FileOutputStream(xFileDest);
    oLog.info(" successfully OPEN The out stream.. " );
    // Copy the bits from instream to outstream
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    tools.putParamValue("CopyFlag","SUCCESS");
    oLog.infoForced(" \n ** R: drive copy status : " + tools.getParamValue("CopyFlag"));

}catch(Exception e){
    oLog.error(" \n ** Error while copying file TO R drive , status : "+ tools.getParamValue("CopyFlag") );
    e.printStackTrace();
}finally{
    try{
        in.close();
        oLog.info(" Closed the in stream " );
        out.close();
        oLog.info(" Closed the out stream " );
    }catch(Exception e){
        oLog.infoForced("\n ** Error while closing file in/out" );
    }
}

------------------------------

if you want to take a back up of existing files or rename the file in shared location use below code:

-----------

/// ******** BCK UP logic 
java.io.InputStream in=null;
java.io.OutputStream out=null;

//CCFFileName  = "CREDITABLE_COVERAGE_SBC.xls";  
String xFileSource = tools.getParamValue("BackUPOriginalFileName");
//String xFileDestination = "/PCS7_DEVB_DRUG_FACETSRx/TestCCFile6.xlsx";
String xFileDestination = tools.getParamValue("BackUpAsFileName");

oLog.infoForced("\n files - to BackUp "+ xFileSource+  " --->  "+ xFileDestination );
java.io.File xlFileOld = new java.io.File(xFileSource);
java.io.File xFileDest = new java.io.File(xFileDestination );
if(xlFileOld.canRead()){oLog.info("Can Read the file from R Drive ");}else oLog.error("\n ** Error Can't Read from R for back up: (no read access)");
if(xlFileOld.canWrite()){oLog.info("Can Write the file to R: drive");}else oLog.error("\n ** Error Can't write to R: (No write access)");

try{
    in = new java.io.FileInputStream(xlFileOld);
    oLog.info(" successfully OPEN The IN stream.. " );
    out = new java.io.FileOutputStream(xFileDest);
    oLog.info(" successfully OPEN The out stream.. " );
    // Copy the bits from instream to outstream
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    tools.putParamValue("BackUpFlag","SUCCESS");
    oLog.infoForced(" \n ** R: drive Backup, status : " + tools.getParamValue("BackUpFlag"));

}catch(Exception e){
    oLog.error(" \n ** Error while taking backup in R drive , status : "+ tools.getParamValue("BackUpFlag") );
    e.printStackTrace();
}finally{
    try{
        in.close();
        oLog.info(" Closed the in stream " );
        out.close();
        oLog.info(" Closed the out stream " );
    }catch(Exception e){
        oLog.error("\n ** Error while closing file in/out In File Back up process" );
    }
}