If you open and save your projects in a separate folder on the desktop, not on the desktop, .bak files will only be created in that folder. You can easily clean them later whenever you want, no complexity. In order to avoid the complaints like "I lost my project, my project is not readable, my computer crashed, can you save my project..." in 7 and earlier versions, the program now saves automatic backups with different names in 8 version, so that there is no data loss. You can turn it off in general settings, but we do not recommend turning it off.