Just started using ALTARO Backup software.
This Free edition contains a full featured backup solution for 2 VM guests.
If you look at the high compression rate (63%) it was able to reduce the VM from 11GB to 3.5 GB
If you get these kind of warnings VM is NOT Application Consistent.
In the VSS settings you can DISABLE the VSS settings for a specific VM to solve the issue.
Highly recommended as a VM Backup Software for Hyper-V and VMWare …