To use the Time Machine do the following steps:
1. Make sure that your HDD is formated in NTFS
2. Connect the HDD to the TV using USB1
3. Go to Time Machine tile
4. In settings, check the Live play feature and check the HDD you want to use.
5. return to the TV channel and see if the grey bar that progressively turns pink appears. Also see if on the bottom right side you have a clock and an x signal.
There you go. It should work now. I have an USB3 Seagate Go Flex HDD with 500GB capacity.