Well, if you want to make backup file of all apps and programs +OS, to my mind the best backup software
is True Image. I've been using it for a long time, and I fully satisfy with it. It's a really convenient and reliable software.
If you want to make a clean syatem install, you'll have to reinstall all programs again, But after that I reccomend you to make a full system backup, so you'll be able restore cleam installed OS whenever you want. It'll take you about 10-15 min to restore all data and apps.
I really recommend you to use this way!