I'm no pro but sometimes my photos get published. Recently, I needed to find an image for publication that I had showed to the editor. The image was first rejected and then later requested. Unfortunately, since it was rejected, I just deleted it. Luckily, my entire photos folder is synced with Dropbox so that I could recall the deleted file through Dropbox's online interface. A quick search later and there it was.
Increasingly, I have been backing all of my personal files into the cloud. It helps maintain consistency across all my computers and it can be a real life saver in times like these!