Bests & Worsts Reviews from Amazon

I am so frustrated. I bought this to save all of my teaching files on since our district is wiping the computers. I turned off my computer and went home, but when I came back the next day and turned my computer on…half of my file folders were empty! The folders were there but empty. So yesterday I worked on remaking things and started saving them again. I came back this morning and it deleted all of the new things I did yesterday! What is going on with this drive?!?!?! I am beyond frustrated!