During a backup could be appear the following error:

[Major] From: [email protected] “C:” Time: 31/08/2015 06:31:52
[81:1009] It was not possible to create volume snapshot for ‘C:\’. System error: ‘VSS Snapshot creation failed’.

[Critical] From: [email protected] “C:” Time: 31/08/2015 06:31:52
Fallback to legacy filesystem backup was not allowed. Aborting the backup.

[Critical] From: [email protected] “C:” Time: 31/08/2015 06:31:52
[81:52] /C
Not a valid mount point => aborting.

To solve this issue, apply tha bundle patch 9.04 from HP Software Support.