QUOTE(DrBlueBox @ Feb 21 2012, 01:45 AM)
Actually what STEAM is doing is the same as you copying the whole folder and pasting it back, so "proper" is not really an apt way to describe it. And usually I don't even have to do copy and paste with Origin as I always install the game in a seperate disk, and just redirect Origin there whenever I reinstall Windows. Can't do that with Steam since it will delete all the files inside there.
So your definition of "backup" is "copy paste"?
The reason why there's a backup is to do another copy, and what Steam have done is implementing the backup system in their platform, encrypting the files and reducing the file size.
For example, reducing the file size of 4GB to 2GB backup files.
Tell me if that was exactly the same as copy paste.
Anyway, it's up to personal preferences.
Some people just prefer to copy paste, but for me. If it's a clean window reinstall. I would prefer the game I install can be as clean as possible as well.