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back up CentOS using the "dd" command

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back up CentOS using the "dd" command

Backup to a Disk Image

how to create an image to an external drive

Using the Gnome Disks Utility

  1. 1. Run the Gnome Disks utility from the Ubuntu programs menu - WRITE DISKS
  2. Select the external drive or disk, and then choose “Create Disk image…”.
  3. Create a file name for the image, choose the folder to store the image, and then press the “Start Creating…” button to begin the process.
  4. Wait for the process to finish. It could take a couple of hours to finish.

Using the Terminal

To backup to a compressed image using a terminal, simply run the following command:

sudo sh -c "dd if=/dev/sda status=progress | xz -c > /media/cupc/image.img.xz"

Replace /media/cupc/image.img.xz with the location where you wish to store your disk image.

It may take a couple of hours to complete.

Restore from a Disk Image

 

Using the Gnome Disks Utility

  1. 1.Run the Gnome Disks utility from the Ubuntu programs menu.
  2. Select the 120GB Disk, and then choose “Restore Disk image…”.
  3. Browse to the location of the image file.
  4. Press the “Start Restoring…” button.
  5. Confirm by pressing the “Restore” button.

Using the Terminal

To restore from a compressed image in a terminal, simply run the following command:

sudo sh -c "xz -d -c /media/cupc/image.img.xz | dd of=/dev/sda status=progress"

Replace /media/cupc/image.img.xz with the location of your compressed disk image.

It may take a couple of hours to complete.

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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