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I want to backup a disk from a remote system, but the remote system itself has not enough space available. Now I want to use ddand pipe the output through ssh, but I can't figure out how to do it. I read several sources on the web, but I'm stuck now.

Can someone please point me to a good resource or write down the command line with explanations?

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Ok, I figured it out:

ssh target_address dd if=remotefile | dd of=localfile

If you fill out the placeholders, you get something like this:

ssh -C username@ "dd if=/dev/sda" | dd of=mydiskimage.img
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there is a missing dd in the second command – Tshepang Nov 5 '14 at 11:44
@Tshepang Can you give the complete command with the dd that is missing? – cringe Nov 6 '14 at 10:43
ssh -C username@ dd if=/dev/sda | dd of=mydiskimage.img – Tshepang Nov 6 '14 at 11:22

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