Windows only: Quickly create a backup of any file by e-mailing it to yourself. That’s the idea behind Backup to Email, which makes it a simple two-step process. Just right-click any file, then choose Backup to Email; the software instantly ferries the file to your Gmail account. (It should really be called Backup to Gmail.) It even splits files larger than 10MB.
Works great – I send my files to a separate Gmail account I keep just for files.