So one of the news in UR3 to Data Protection Manager 2012 R2 is the Scalable VM Backup
This adds more scale to each DPM server ensuring backup of the VM on each host
http://support.microsoft.com/kb/2966014
Features that are implemented in this update rollup
- Scalable VM backup
This update rollup improves the reliability at scale for Virtual Machine (VM) backups on Hyper-V and Windows Server 2012 R2 infrastructures. This feature is supported on both Cluster Shared Volumes (CSV) and scale-out file server (SOFS) storage configurations for VMs.
Prerequisites- You must apply the following Windows hotfix:
Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update: April 2014
- You must upgrade the DPM 2012 R2 agent to DPM 2012 R2 UR3 on all nodes of Windows Server 2012 R2 Hyper-V clusters.
- You must restart the cluster nodes.
- You must apply the following Windows hotfix:
Ensure April Update on Everything
So patch your test dpm servers and update the agents
Reboot is NEEDED even on 2012 R”
Sucess 
You will need to run a consistency check of all VM’s
DPM issues a checkpoing before the CC
After checkpoint is complete we can create a recovery point
And we can see the snapshot being created and the deltas moved.
and on the plus side , no more errors on the VDS Basic Provider after the upgrade , and from the testing so far no issues with ODX enabled
PATCH TEST WAIT DEPLOY in PRODUCTION