Restore Error - Error code 88

I received the following message while trying to make my first backup copy.
Restore Error
WIM-based device to device restore failure with error code 88

I could not find information here about this error code here or on the web. Failure came about 70% compete on the step “extracting file data”. Backing up to a 1.5TB external drive.

MacBook Pro (Retina, 15", late 2013) 400GB Mac Partition and 600GB Windows 10 partition running latest, patched version of Windows 10.

suggestions?

WIM-based imaging can fail if there is file corruption. Try switching to block-based mode in the preferences.

tim