As of with OVS3 I could not find any command to import / export running guests images.
The easiest way I found was to take backup of current virtual disk & restore it to same / another server. If you restore to diff server, you need to create guest vm & attach restored virtual disk
Backup
Shut running vm
copy / zip / gz existing image
Howto find which image to copy?
Click on VM & select info tab, there you’ll find virtual disk image name (storage), which you need to backup.
Restore
Save / extract image to the current vm repository
refresh repository & verify new image is available
create new vm,
do not create disk
select new image
set disk in boot order & finish
image should boot
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