All depends on user, do you want to save files, backup info? Then leave it 50/50. I am different from most but have been working with PC's for 20 years. I install games and music to my "backup" and copy over my documents for backup incase Windows somehow gets messed up and reinstall is required, this way music is not lost or copy of my documents. For most novice user it is recommended to keep it 50/50 so you can backup your profile using Windows backup and if something were to happen, the important files can be restored. You can get most stuff back nut those pictures and letter/resumes may not be as easy to recover so leave as is and read up on backup/restoring data.