This eMMC DOES NOT come preinstalled with an OS. If you wish to back up this eMMC to your computer or write a OS image to it, you'll need a way to hook it up to another computer with one of the two following solutions:
128GB eMMC module for PINE A64-LTS, Pinebook, ROCK64 Media Board Computer and SOPINE Baseboard “MODEL A” - Also compatible with most other SBCs with a removable eMMC module.