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aggi

I'm trying to back up my primary ssd to an external hard drive using dd

NAME                  FSTYPE        SIZE MOUNTPOINT LABEL
sda                               238.5G
├─sda1                ext2          487M /boot
├─sda2                                1K
└─sda5                LVM2_member   238G
  ├─ubuntu--vg-root   ext4        234.3G /
  └─ubuntu--vg-swap_1 swap          3.7G [SWAP]
sdb                                 1.8T
├─sdb1                              300G
├─sdb2                ext4          300G
└─sdb3                ntfs          1.2T            1200Size

I'm trying to back up sda to an image file on sdb2 using the command

sudo dd if=/dev/sda of=/dev/sdb2/plexdisk.img

but getting the message

dd: failed to open '/dev/sdb2/plexdisk.img': Not a directory

Any suggestion what I'm doing wrong? Cheers

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paradroid in reply to @aggi

You haven't mounted the target partition, sdb2 is just the device node. Also I suspect there's a chance you'll end up with a corrupt image if you dd a drive (your sda) while there are partitions mounted as rw.

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