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Thank you for your answer Vitalius, but all school computers are on Windows 7. Also, I would prefer a solution that is compatible with all versions of Windows, from 7 to 10.

Thanks for your answer! Those external drives must work in any computer I plug them in. Even computers that do not have raid enabled.

Windows 7 ! Thank you I just edited my post !

Hi, I have one 4tb external drive that I want to mirror on a second one(exact same capacity). I transfered all the content(mostly photos and videos of our school activities) to the second one already. I then made some changes on the first drive and I would like to mirror those changes on the second one. I mean deleting files that have been deleted, update some files and copy the new ones. What is the best way to manage this operation? I tried with some free tools and it was slow of buggy. Im willing to pay for a good Windows 7 software that would automate that process when I connect the two drives every months. It is important for me that the drives are external drives, I will also mirror on a third one to have a second backup. Thank you !