Windows Server Backup of Hyper-V VMs uses up disk space

We have a Server 2012 R2 Standard Hyper-V server running four VMs, with the VMs stored on a separate partition from the OS.  The VMs partition has around 30GB of free space and we found that when the backup started running overnight the backup locked up as the VMs partition ran out of space due to creation of temporary checkpoint files.  Since the company doesn't run 24/7 we disabled the Backup Hyper-V integration service so that backups would be taken offline, but we found that this still happens.  We have now installed an extra disk and pointed the checkpoint location for each VM to that disk, but again the VMs partition is filling up when the backup runs, why is this and what can be done?
mtxitAsked:
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mtxitAuthor Commented:
Further to this, we've just run a backup and can see that what's using up the free space is .AVHDX files for each of the .VHDXes.  As we're now doing offline backups of the VMs shouldn't it no longer create these .AVHDX files?  We've specified a separate location for checkpoint files, is there a way to specify a different location for the .AVHDX files created when backups are taken?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You need to ensure, that you have 20-30% FREE storage, to Backup the VMs.

This allows for the snapshot files, which are being generated per backup.

OR, when you are creating backup jobs, only backup a single VM per job, at a time.
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mtxitAuthor Commented:
Thanks, my point was that we'd pointed the snapshots at a different drive, but when the backup was running it appeared to be creating those backups on the drive that the VHDs are stored on, is that normal?
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Muhammad BurhanManager I.T.Commented:
May be the targeted volume is not VSS enabled, ensure the vss service is running on that volume
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mtxitAuthor Commented:
Apologies for the abandoned ticket, we resolved this issue eventually by adding additional storage and expanding the partition containing the VHD to create more free space.
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