Windows 7 An application that backups Windows 7 applications

[Marios]

Do you know of a backup application that backups only the applications i have installed on Windows 7?

 

[Trouble]

Short answer..... nope.
Assuming it's your intention to preserve the applications in a state which would support your not having to reinstall them in the event of something catastrophic happening....
Then the only way I know to do that since it involves many things including dynamic link libraries as well as windows registry entries, would be to create a system image, thereby preserving the entire machine, captured at a particular point in time.