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To identify problematic virtual machines that do not meet Microsoft requirements for online backup of the Hyper-V host, you can run the following command on the Hyper-V host.
diskpart
.diskshadow / L C:\vss-hyper-v-test.txt
list writers
exit
.All listed virtual machines with either “Offline” or “Saved” status do not meet Microsoft requirements for online backup of Hyper-V hosts. These can be dealt with using the checklist in the next section.