Arthur stared at the blinking cursor on his final-year thesis. The file name read FINAL_Thesis_v5_FINAL_REAL.doc , but the little red "x" next to the USB drive icon told a different story. The drive was dead. Corrupted. Two months of research, gone.

The next morning, he proudly showed Maya. "I installed Dropbox on my PC."

He opened the file. It wasn't corrupted. It was all there.

"Anything you put here is safe," the screen read.

Arthur opened his browser and typed dropbox.com . He clicked the blue "Download" button. A file named DropboxInstaller.exe appeared at the bottom of his screen.