Thank you for the explanation on what you mean by a virtual drive. (.vhd or .vhdx)
The reason why NetWorker does not back this up when you are performing a scheduled backup is because of the following reasons:
Also since this is a virtual drive, there is is actually a container file that is on the Windows file system. For example:
DISKPART> list vdisk
VDisk ### Disk ### State Type File
--------- -------- -------------------- --------- ----
* VDisk 0 Disk --- Added Unknown C:\temp\test-vhd.vhdx
Here, you can see that this virtual drive is actually stored on: C:\temp\test-vhd.vhdx.
So, if you backup up the C:\ drive, then this virtual drive container will also be backed up by default., although you are then limited to backing up and recovering the entire disk. And backups would only be possible if that file is not open and locked.
If you want the ability to perform file level backup and recovery, then your only option is to perform manual/local backups using the save command. You have already confirmed that this works.
Thank Wallace for the information. But what's really weird is that in version 8.2.4 we were able to save virtual drive. Since we use the version 9.1.x it is no longer possible. Then I will probably install the old version again.