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Here’s how you can back up an entire hard disk across the internet (compressed with xz to save as much bandwidth as possible, also using pv for progress):

$ ssh -p 2222 root@sonzona.dyndns.org 'dd if=/dev/xvda1 | xz -c' | pv > sonzonaroot.img.xz

To view your files on the other end:

$ xz -d sonzonaroot.img.xz
# mkdir /mnt/disk
# mount -o loop sonzonaroot.img /mnt/disk

You can always not xz the image up if you happen to be limited by CPU or RAM, rather than bandwidth.

Happy dd‘ing!


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