FreeFileSync is a free and open source file synchroniser. It comes with RealTimeSync, which can detect changes in a file or folder and run a command to execute a batch job. The application can be run as a Windows Service using FireDaemon Pro, which lets you start the application automatically at boot prior to login, start multiple instances of the application and more. This HOWTO will show you how to set it up. You can also use Fusion to manage FireDaemon and other Windows services via a web browser.


FreeFileSync Setup Under FireDaemon Pro

Download FreeFileSync from the official website.


Run the installer. This will also install RealTimeSync. By default, the program installs to C:\Program Files\FreeFileSync, so we will use this directory for the purposes of this HOWTO.


Run FreeFileSync to configure the directories you want to sync. Once you're finished, select Save as Batch File from the File menu. Since this batch file will be running as a FireDaemon service, we recommend checking the "Run Minimised" box and selecting "Close progress dialog" from the On Completion dropdown. We also recommend selecting to ignore errors and writing any errors to a logfile that you can check regularly. Once you've configured your settings, click Save As to name and save your file.



Download and install FireDaemon Pro into the directory of your choice, typically C:\Program Files\FireDaemon.


Next start the FireDaemon GUI from the desktop shortcut. Click on the "Create a new service definition" button in the toolbar (or type Ctrl+N) and enter the information into the fields as you see below. Adjust the paths to suit your installation. Note the required parameters.



  • Executable: The path to the RealTimeSync.exe file. The default path is C:\Program Files\FreeFileSync\RealTimeSync.exe
  • Working Directory: The path to the directory containing the RealTimeSync.exe file. The default path is C:\Program Files\FreeFileSync
  • Parameters: Enter the path to your .ffs_batch or .ffs_real file. Be sure to include the path in quotes if the path contains spaces.


Now click on the Settings tab. If you DON'T want to see RealTimeSync running, uncheck the Interact with Desktop check box & select "Hidden" from the "Show Window" dropdown. You must run RealTimeSync as the user you installed it as. In the Logon Account field type your username (e.g. Administrator) and then enter the user's password twice in the Password and Confirm fields. You can change the Process Priority to allocate more CPU time to RealTimeSync or specify which CPU or core the application will run on (in the case of multi-processor, hyperthreaded or multi-core CPUs).



Now click OK to finish setup and start RealTimeSync!