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You can prevent the system from creating restore points in your external hard drive by following these steps:

a) Press Windows key + F key on the keyboard and type “System Restore” and click on the “settings” tab below
b) Click on “Create a restore point” in the search results
c) Now, in the new window, under “system protection” tab, select your External hard drive and click “Configure”
d) Click on “Disable System protection” and click Ok to save settings.