As I said, you should not partition for data management. It'll only get in your way. You won't get any kind of benefit out of it. Use folders instead. Windows is designed to work on one partition.
A section for backup could only be useful for virus problems. That might be a legitimate use, but it won't insure you against physical problems, which I think are more common among people who don't click stupid links and use antivirus software. You should get a separate drive for backup.