Windows Server 2012 R2 host servers are members of a Server 2008 domain, hosted on of the servers. All guest VMs are Windows Server 2008 SP2. Backup Exec 2014 SP2 media servers are also on guest VMs, backups saved to local Backup to Disk drives in the virtual machines. Windows Agent installed and up to date on all host servers and guest VMs, Agent for Hyper-V is enabled. Backup targets are on different Hyper-V hosts. Hyper-V backups are set up individually for each VM though the Microsoft Hyper-V Host object. All Weekly Full backups run successfully, all Daily Differential backups fail with an exception now that I've turned off the option to "Use the full backup method for virtual machines that do not support incremental or differential backups". I don't have the space for a full backup every day.
Backup- VRTSRV::\\SRV0001G\Hyper-V?Virtual?Machine\SERVERABCD123
V-79-57344-38324 - Incremental\\Differential backup methods are not supported for this VM. The backup job failed, since the option 'to fall back to a full backup' was not selected.
My immediate question is, what is required for the VMs to support inc/diff backups, or looking at it the other way, what could make them incompatible? I am out of ideas. I have had a case open since last week, but the technicial keeps messaging me after I leave for the day, complaining that he cannot contact me!! I will repond to request for more information. Thank you!