WD’s latest My Passport Wireless Pro external hard disk can cut the cable. It allows you to use either USB 3.0, or Wi-Fi AC, or plug in an SD card, or attach an OTG device. It runs on battery for much of the day, and you can even use it as a power bank.
It’s an external 2 or 3TB hard disk. It has a 10-hour battery. It has Wi-Fi AC dual band, an SD card, and USB connectivity. It has a Plex media server. It has everything a person on the go needs.