Client running Windows Server 2016 running Windows Server Backup and Eset File Security For Microsoft Servers. Everything was fine till I updated the ESET File Security to version 7.1.12006.0. Then I started getting backup error exclusive lock on the EFI system partition when it tried to do the VSS. If I disable the ESET it was fine but soon as I re-enabled ESET the error would come back. I uninstalled ESET and reinstalled the older 7.0.12014.0 version and everything was fine.
Something in the new ESET is affecting Windows Server Backup. Found this on ESET Forum describing the same thing. They say version 7.2 will fix it.
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