Offline backups since upgrade to 2012 R2

Hi, here is a topo of what I use:

Windows 2012 R2

SCVMM 2012 R2

DPM 2012 R2

All VM are in a cluster

I have been having an issue since the upgrade of my Hyper-V host from 2008 R2 to 2012 R2. Since the upgrade of my hosts from 2008 R2 to 2012 R2, the VM in DPM are showing, but only in a offline mode. Before, they were showing online.

I have read that the VM would be taken offline when:

1. The Backup (Volume Snapshot) Integration Service is disabled or not installed.
2. A virtual machine has one or more dynamic disks.
3. A virtual machine has one or more volumes that are based on non-NTFS file systems.
4. In a cluster configuration, the virtual machine Cluster Resource Group is offline.
5. A virtual machine is not in a running state.
6. A Shadow Storage assignment of a volume inside the virtual machine is explicitly set to a different volume other than itself.

But all my VM were taken online before. And none of the configs changed.

Also, the VM I create in SCVMM 2012 R2 give me the option to take the backup online.

The difference I’ve noticed is that the “Bus Configuration” shows IDE devices attached and SCSI Adapter attached for the old ones (created with 2008 R2). And only SCSI Adapters for the new one (created with 2012 R2).

So, after this beautiful story, here are my 2 questions:

1. Why are my backups are being taken offline and does this makes a difference in the data being taken?
2. Is there a way to have them being taken online again?

Thank you,