Raspberry PI: Backup SD card with dd command under Linux

First, know your partitions:
fdisk -l

Full backup of the image:
dd if=/dev/sdx of=/path/to/image
or for compression (recommended):
dd if=/dev/sdx | gzip > /path/to/image.gz
 
To restore the backup you reverse the commands:
dd if=/path/to/image of=/dev/sdx
or when compressed:
gzip -dc /path/to/image.gz | dd of=/dev/sdx 

The info is from here.

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