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ClintonKFlag for United Kingdom of Great Britain and Northern Ireland

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BackupAssist error "The backup of volume (EFI System Partition) (100.00 MB) could not be completed"

Hyper-V server with two Windows 2016 VMs.
BackupAssist on the Hyper-V manager and attempting to perform a System Protection backup to a LAN connected NAS drive.
The Hyper-V Manager is in a Workgroup. The two VMs are in a domain - VM#1 is the PDC01 and VM#2 is DB01 (SQL Server).
When I run the backup for PDC01 I get error "The backup of volume (EFI System Partition) (100.00 MB) could not be completed."
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Philip Elder
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Most in-guest backup software products will only back up the NTFS partitions. ShadowProtect is like that and that's our go-to in-guest backup product.
What version of Backup Assist and what error is listed in it's logs?
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BA Version 10.3.1
The Progress Log shows this. Just before as it fails it says it can't find the EFI partition.

Retrieving volume information...
This will back up (EFI System Partition),(C:),RAID1(D:),RAID10(E:), HyperV\PDC01, HyperV\DB01, HyperV\Host Component to \\jglnas001\JANDG.
The backup operation to \\jglnas001\JANDG is starting.
Summary of the backup operation:
------------------
The backup operation stopped before completing.
The backup operation stopped before completing.
Detailed error: The specified backup disk cannot be found.
Log of files successfully backed up:
C:\Windows\Logs\WindowsServerBackup\Backup-04-05-2018_17-26-28.log

Log of files for which backup failed:
C:\Windows\Logs\WindowsServerBackup\Backup_Error-04-05-2018_17-26-28.log

There was a failure in preparing the backup image of one of the volumes in the backup set.
The specified backup disk cannot be found.
From this:
https://community.spiceworks.com/topic/416480-windows-server-2008-r2-backup-failed

"Because the EFI is FAT32 formatted, it cannot be backed up using the Volume Shadow Service that is used for backups.  It has to be handled manually. Luckily, it does not contain changing data, so just take a manual copy once and don't use the backup software to try to back it up, there is no need for it to be in your regular backup set."
I've created a new Test VM which is just a standard Window 2016 build and then tried to backup just that VM only.
The Hyper-V manager is in a workgroup and the VMs are in a domain. The backup user is a local Hyper-V user.
I keep getting failures of the type "The backup of volume RAID1(D:) could not be completed. Error: The mounted backup volume is inaccessible. Please retry the operation."
I don't suppose it could be a permissions thing could it? I can't believe BackupAssist can't backup a standard VM
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Philip Elder
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Yes, I didn't think of that. I'll check the NAS
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The problem was in fact to do with the destination rather than the source (very misleading messages IMHO).
I reconfigured the backup to use a data container (vhxd file) and all backs up OK.
(I have some issues with the restore but I'll save those for another post.)
Thanks all for your input.