You won't be doing remotely significant backups over NFC since the transfer speed on it is only ~400kbps. Bluetooth isn't a whole lot better at ~2Mbps unless you go with 3+HS which actually runs over WiFi. So, for remotely large backups, you will likely want to use something that goes over WiFi or USB2/3.
NFC is mainly intended for tag info and automating setting up alternate communication channels (usually Bluetooth or P2P WiFi) for bigger file transfers.
So NFC on the desktop does not seem to be particularly useful on the desktop IMO - even less so if your contacts, calendar and other stuff are already sync'd over the cloud or other automated process.