Hi, this doesn’t seem that simple to achieve as essentially you would have to run dd for each partition. You can see the image partition layout we use here: https://www.balena.io/docs/reference/OS/overview/2.x/#image-partition-layout.
Expanding on this, though, assuming you haven’t modified the root filesystem everything other than the data partition is already on the img files that balena releases so you can just use these and then use a backup to recover the user data if required?
As for backing up the user data there are several alternate methods such as those discussed here: Backup Docker Volumes.