Lost all of my photos

My computer was acting really weird yesterday & it seems like everything that I had saved on my computer is gone. My background, photos, blog photos, all my pinterest pics (that I hadn't pinned). I have been wanting to back up all the pics on the hard drive, but didn't have the time. I'm so bummed out, but luckily I have a lot of stuff on different websites. So back up all your stuff right now, so you're not in the same boat as me.