I don’t know what you did but this link shows you how to dd from Mac, Linux, or Windows.
https://thepi.io/how-to-back-up-your-raspberry-pi/ (It’s not just for Rpi’s.)
Works for me. Make sure your backup media is good and test it when you finish to make sure it actually works.
I'm having a similar issue as OP.
Been converting OS drives from other computers using a docking station (P2V) with
sudo qemu-img convert -p -O qcow2 /dev/sdb '/mnt/OMV/nfs share/imagename.qcow2'
This has worked great for legacy BIOS systems, 3 done so far.
But now I'm having problems with a UEFI system drive, LinuxMint 18.3 installed on drive, partition 1 EFI boot, partition OS, partition 3 swap.
Will only boot to UEFI shell.
I can attach the imagename.qcow2 image to another vm and read the partitions contents.
So it is not corrupt.
No partitions mounted at conversion time (worked well for legacy conversion, no accidental reads or writes).
Using OMV KVM plugin (by ryecoaaron ) to configure and run vm's.
Question: Is there anything else / special I can set in the KVM plugin set up?
I've tried Chipset i440FX & Q35, UEFI On & Off, Storage Volume Bus virtio & sata
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