Splitting FFS backups between two physical drives.

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[url=https://pzgg1fpeau.joplinusercontent.com/shares/oPR5cfq5qMoAdLZxlE3XuM]Splitting FFS backups between two physical drives.[/url]

Since you are splitting the data because of physical hardware limits (the destination drives are smaller than the source), the most reliable method is to use Include Filters. This ensures that Job A only “sees” its 50 GB and Job B only “sees” its 50 GB, preventing any “Disk Full” errors mid-sync. Here is the best way to execute this specifically for two different physical destination drives.

1. Group Your Folders by Size Before opening FreeFileSync, you need to know which folders will fit on Drive A and which will fit on Drive B.

• Source Drive (100 GB): Contains Folder_1, Folder_2, Folder_3, etc.
• Destination A (60 GB): Will hold Folder_1 and Folder_2.
• Destination B (60 GB): Will hold Folder_3 and Folder_4.

2. Configure Job A (First Destination)

• Connect Destination Drive A.
• In FreeFileSync, set your Source to the 100 GB folder.
• Set your Destination to a folder on Drive A.
• Click the Filter (Red Funnel) icon.
• Crucial Step: In the Include box, delete the * (which means “everything”) and type the specific folders for this drive:
  • \Folder_1\
  • \Folder_2\
• Click Compare. You should see exactly 50 GB ready to sync.
• Click Synchronize.
• Go to File > Save As and name it Backup_Drive_A.ffs_gui.

3. Configure Job B (Second Destination)

• Disconnect Drive A and connect Destination Drive B.
• In FreeFileSync, keep the Source the same, but change the Destination path to point to Drive B.
• Click the Filter (Red Funnel) icon again.
• In the Include box, remove the old folders and add the remaining ones:
  • \Folder_3\
  • \Folder_4\
• Click Compare to verify the remaining 50 GB.
• Click Synchronize.
• Go to File > Save As and name it Backup_Drive_B.ffs_gui. Why use “Include” instead of “Exclude”? When spanning data across multiple physical disks, using the Include filter is safer. If you add a new Folder_5 to your source drive later, an “Exclude” setup might accidentally try to back it up to a drive that is already full. With “Include,” nothing moves unless you explicitly add that folder to one of your two saved jobs. Summary Table for your Setup