How to backup a Compute Module 3 Plus eMMC to a .img file in an external USB stick to be reuse in other CM3 modules for production?
Is this possible?
There are a few ways of making a backup of your EMMC/SD card. The simplest to implement is to make a 1:1 binary copy of your data to an image file. For this task you can use a tool such as dd or Win32diskImager. Note that all the commands that follow expect to have the variable $backupDir replaced by the path to your desired backup directory (which can't be on the same partition you're trying to backup for obvious reasons).