I play minecraft on my own computer and my boyfriends. I use his for modded survival. I haven't played on his computer since August. He rarely uses that computer so he didn't have a chance to notice a problem until last week. He texted me to ask if I had deleted everything off his computer. He said tonight that all of his things were gone (files, pictures, everything). All of my things were still there (everything minecraft related). Could backing up my minecraft world cause this? I don't know if his things can be retrieved, but I hope they can because those pictures can't be replaced. I honestly feel awful and I hope I can find some way to fix this. If this wasn't the cause, does anyone have any ideas on what I could have done to cause this?