[WITHOUT ROOT] adb backup???

I am trying to backup my game data in android device (move from old device to new device)

I currently HAVE NO ROOT on BOTH DEVICES.

I just need to backup the game data and the app data.

I googled the adb backup but there is no documentation from android SDK site.

but in some other forum someone said I can use the following script to backup "JUST DATA"

and I wish to confirm it once more before I move

and for restore JUST
I also wish to know what parameters can be added to adb backup ?? there is NO OFFICIAL DOCUMENTATION to support

THANKS:p