This step-by-step tutorial will demonstrate how to backup your PlayStation4 game data to a USB drive. It's recommended that you make use of a high-capacity USB drive, formatted in FAT32 or FAT.
Export PS4 Saved Games to a USB Drive
Connect the USB drive to your PS4. Then go to Settings > Application Saved Data Management:
Select Saved Data in System Storage:
Followed by Copy to USB Storage Device:
Tick the checkboxes displayed next to the games you'd like to backup and select Copy.
Import PS4 Saved Games from a USB Drive
You can restore your saved game data from the USB drive by going into Settings > Application Saved Data Management > Saved Data on USB Storage Device and selecting the desired files.