creating partitions/volumes on the same disk to save backup copies is not a good solution. when you create backups of your files, transfer them to a separate disk or media and ALWAYS save them in a format that a common malware does not touch or cannot normally modify. For example: .ISO, .NRG files; these files can be burned to a DVD-RW/DVD9-RW as well. You can schedule backups.
You can also use NT backup or disk images to backup your files (you can use DVD-RW or DVD9-RW if you dont have a separate disk) - they're easy to create and restore. That way you don't have to reformat and manually reinstall everything (your apps, your OS,your drivers, your files, etc.). All it takes is a 5-15 minute wait - that's the fastest way to recover your files and OS state. You have to create backups on a regular basis. Make it your habit.