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Some ideas:<br><br>1. In Veeam try creating a NEW backup job, select just that VM and back it up. Does it work?<br><br>2. Using Hyper-V Manager are you able to export the VM to make a copy of it?<br><br>3. Using PowerShell from the Hyper-V host, if you run Get-VMsnapshot –VMname MYSERVER does it give any helpful info?
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Thank you<br><br>1. Tried this - Veeam complains about a missing disk<br><br>2. HyperV creates the folder where I try exported - but its blank<br><br>3. This runs ok and reports the following - seems OK but the fact that windows server backup complains no EFI partition found im pretty sure it wont boot on restart but its running fine - <br><br>PS C:\Users\Administrator&gt; Get-VMsnapshot –VMname 2016<br><br>VMName Name &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SnapshotType CreationTime &nbsp; &nbsp; &nbsp; &nbsp;ParentSnapshotName<br>------ ---- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ------------ ------------ &nbsp; &nbsp; &nbsp; &nbsp;------------------<br>2016 &nbsp; 2016 - (11/08/2020 - 12:17:16) Standard &nbsp; &nbsp; 11/08/2020 12:17:21<br>2016 &nbsp; 2016 - (06/04/2021 - 18:43:06) Standard &nbsp; &nbsp; 06/04/2021 18:43:14 2016 - (11/08/2020 - 12:17:16)<br>2016 &nbsp; 2016 - (08/04/2021 - 19:11:59) Standard &nbsp; &nbsp; 08/04/2021 19:12:04 2016 - (06/04/2021 - 18:43:06)<br>2016 &nbsp; 2016 - (24/04/2021 - 10:08:57) Standard &nbsp; &nbsp; 24/04/2021 10:09:03 2016 - (08/04/2021 - 19:11:59)<br><br>I copied all the VM folders to a NAS before the merge - can I use these in worst case to recreate VM - its not a backup - just a copy and paste ?<br><br>
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A Windows 2016 HyperV VM had grown with multiple AVHDX files - took a copy of the whole VM folder and then reluctantly merged the files as have had issues before with VHDX files not being found subsequently.<br>The merges completed - VM still running fine - disk space reclaimed. Now when I try to backup using VEEAM complains cannot find the disk. Creating checkpoint also complains not found. Tried Win Server Backup complains EFI Specified disk cannot be found. So Im pretty sure if this VM has to reboot it wont boot !<br>Is there anything I can do to fix this in the running VM without resorting to the backups (VEEAM and Windows Fwhich will hopefully work but result in downtime / some live data loss)<br><br>Thank you !<br><br>
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A Windows 2016 HyperV VM had grown with multiple AVHDX files - took a copy of the whole VM folder and then reluctantly merged the files as have had issues before with VHDX files not being found subsequently.
The merges completed - VM still running fine - disk space reclaimed. Now when I try to backup using VEEAM complains cannot find the disk. Creating checkpoint also complains not found. Tried Win Server Backup complains EFI Specified disk cannot be found. So Im pretty sure if this VM has to reboot it wont boot !
Is there anything I can do to fix this in the running VM without resorting to the backups (VEEAM and Windows Fwhich will hopefully work but result in downtime / some live data loss)
Thank you !

Fix Running HyperV which will not backup or create checkpoints - disk not found

Veeam® has pioneered a new market of Availability for the Always-On Enterprise™ by helping organizations meet recovery time and point objectives (RTPO™) of less than 15 minutes for all applications and data. Veeam develops backup, disaster recovery and virtualization management software for VMware and Hyper-V virtual environments. The company focuses on products that help with virtualized workloads, reduce downtime, and ensure the system Availability required by service-level agreements.

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Hyper-V is a native hypervisor; it can create virtual machines on x86-64 systems and supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks. Hyper-V Server supports remote access via Remote Desktop Connection. Administration and configuration of the host OS and the guest virtual machines is generally done over the network.

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Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.