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Hyper- V backup "File exclusion is not supported"

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Getting the message "File exclusion is not supported" when I run my Hyper-V backup. This is odd, as there are no file exclusions in place for this backup job. Basically, I have one Hyper-V machine and I've set the backup to back up all the Hyper-V VMs running on that machine. This has only been a problem since 11.7 was installed.

The Hyper-V server is running Windows 2012 R2, with Hyper-V manager. The Backup is run from a machine running Windows 2012 R2 and Acronis is Acronis Backup Advanced 11.7

 

Any help would be greatly appreciated

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This warning was added only in version 11.7 . All backup tasks exclude shadow copies storage ( \System Volume Information\*{3808876B-C176-4e48-B7AE-04046E6CC752} . Exclusions for agentless backup of HyperV machines are expected to work if file system inside is supported by Acronis Backup and backup is not performed in sector-by-sector mode. Sector-by-sector mode may be turned automatically if filesystem inside VM is corrupted.  Is there a specific VM that triggers this warning , or all of them do?

There are a couple of VMs that give this warning. I read that Linux VMs can cause this, but of the four Linux VMs I have, only two of them produce this error. 

Do  they all have the same partition types (of those included in backup)? E.g. for swap  partition exclusions are not supported, but for ext2-ext4 they are.

They are all identical. Basically I have created a hyper-v backup and just selected all virtual machines and the Host/Cluster. I haven't spredified anything else. I've attached a pic of the backup items I have selected

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