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back up CentOS using the "dd" command

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back up CentOS using the "dd" command

if=/dev/sda Is cloning the entire disk and of=/dev/sdd1 Is writing to a partition. Which doesn't make much sense.

You may want to clone the entire disk onto another disk

dd if=/dev/sda conv=sync,noerror status=progress bs=64k of=/dev/sdd

Or yet clone to a compressed image

dd if=/dev/sda | gzip  > /sda.img.gz

And restore like so

gzip -d /sda.img.gz | dd of=/dev/sda

to create the image. There where four partitions in my sda

  * EFI system
  * Microsoft reserved 
  * mircosoft basic dat 
  * Windows recovery environment 
 

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