====== Backup with dd ======
<code>
sudo dd if=/dev/mmcblkX of=/path/to/image.img status=progress
</code>

===== Backup with gzip =====
<code>
sudo dd if=/dev/mmcblkX | gzip -c > /path/to/image.img.gz
</code>

====== Restore with dd ======
<code>
sudo dd if=/path/to/image.img of=/dev/mmcblkX status=progress
</code>

===== Restore with gzip =====
<code>
gunzip -c /path/to/image.img.gz | sudo dd of=/dev/mmcblkX
</code>

===== Restore xz-image =====
<code>
xzcat /path/to/image.img.xz | sudo dd of=/dev/mmcblk0 status=progress
</code>