I was trying to back-up my recent files from my Mac to my external harddisk. I don’t know what came over me, I went on external harddisk to Mac so everything I’ve worked on was overwritten with the old files and then I accidentally erased everything on my external harddisk too..oh god, I think I was possessed..I was lucky to have some of the files in my computer though but still, why would I do that? Seriously /facepalm