Using NBU on appliance ver 126.96.36.199
When backing up a Vmware 6.7 ver (17700523)cluster from Vcenter 6.7 ver (188.8.131.52000) the job is randomly failing in the snapshot and backup. Backup detailed status displays:-
FTL - cleanup() failed, status 11
Error bptm (pid=42113) media manager terminated by parent process
Rerun of job generally runs without issue.
How busy is the system at the time of the failures (as in how many other Vmware backups are happening)?
I'm seeing some internal notes about this relating to the total number of connections to VMware. If you think this might be the issue, I'd suggest logging a support call and make reference to article 100052472 (internal only for now).
Assuming you are using VIP, you could try tweaking some of the VMware resource settings to see if that can help to reduce the load on the vCenter server(s).
If you are doing it the old way, you can use the STU and policy settings (limit jobs per policy) to try to achieve the same (just not as simple).