Backwards Compatibility for NAS Backups

We are using a Snapserver NAS N2000 and are migrating from CA ArcServe to Symantec Backup Exec 2012. When attempting to install a BE agent on this device, Overland Storage support advised me that this model doesn't support BE2012 agents, only 2010R3 agents will work. My question is if BE2012 is backwards compatible with 2010R3 agents?

I also wanted to confirm that RALUS_RMALS_RAMS-5204.4.tar.gz is the correct agent file for this device.

Thanks in advance for any help!