VSS problems backing up windows 2012 R2 server VM in hyper-v server

[LovelyLouvelle]

I have a single Hyper-V 2012 R2 server host with 2 VMs running windows 2012 R2 server with the latest updates.The VMs are backed up using Altaro VMBACKUP which runs on the host.The first VM is a DC which is backed up successfully.The second VM OS is Windows 2012 R2 with Exchange Server 2013 onpremise.This VM has been backing up for years without any problem and since 2 months ago the backup has been failing.The Altaro VMBACKUP shows the following error:There was a problem while rolling back the latest failed backup for this VM to the last consistent state. (Error code 'ROLLBACK_306')The rollba

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