Hyper-v: Need a WMI API to get changed blocks given a reference point and a backup checkpoint

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windows 10 hyper-v has introduced new backup , restore apis backup , restore virtual machines. presently per documentation backups exported unc path or local folder in hyper-v host. 

we interested know whether there wmi api gives list of changed blocks given reference point , backup checkpoint. 

if such facility not present there no way directly backup tape devices. hence backup vendors have wmi api lists change blocks given reference point , backup checkpoint. 

the list either of form such offset,length or start sector , number of sectors etc. 
list in xml form.

backup vendors have capacity read blocks vhdx image files. 




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