Uh, what is "everything"? All your apps are in the cloud, minus save files. Same with google music. Just sign in with your google account on the new device and tell it to restore. We don't know what you use your N7 for.. so it's a bit difficult to answer if a transfer is even necessary.
If it's things like pictures, documents, etc, you can use google drive, dropbox or cloud of your choice.
I normally use dropbox to transfer around data for my PC and other android devices.