How to backup eMMC of the compute module ?

Question

how to make a image back from the compute module to external usb for backup / restore ? I can successfully flashing the eMMC but dd command is not working in reverse.

clem57 · Answer

Firstly make sure you have "if=/dev/sd?" where ? is correct letter. No number is needed since you want the two or more partitions, right? You may want to read Instructions for Using the NEW Raspberry Pi Compute Module Development Kit for other ideas.

Clem

clem57 · Answer

The DD command will clone eMMC to USB bit for bit destroying the USB as you have above. Then Win32 utility can take USB and create a file of the same USB into a file name for backup.

Clem

PS a short cut would be to set of=/dev/sda1/backup.img to create a file on the USB. But that would be an unloaded version and not able to boot using USB which your original question implied.