Because:
1. I have a dozen VMs, each of which would need a backup job. Much more 
complicated backup setup.
2. The VM would need to be running to backup,
3. I can only run a few at a time due to host system limitations. Make 
that work automatically would be much more difficult than just backing 
up the host drive.
4. I only run them when I want to experiment on something or for training.
5. Most are Windows systems and it's not clear that Backup PC can make 
an 'Image' backup that can be used to recover from a corrupt system (see 
4). Of course with a VM I can make a snapshot to recover it.
6. If the host disk fails, it would be hugely more difficult to recover 
the dozen VMs, one at a time.

But isn't it much more interesting that I've seem to have found some 
kind of limit to Backup PC?

On 01/19/2017 07:03 AM, G.W. Haywood wrote:
> Hi there,
>
> On Wed, 18 Jan 2017, John Spitzer wrote:
>
>> ... The backup I'm creating has quite a few very large files. On the
>> order of 20 - 50 GBytes in size. These are VirtualBox VMs disk files.
> That's insane.  Why not just back up the files on the VMs instead?
>


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