VMware NSX
The QuartzSetupServiceImpl service is not running on the service's leader node. Without this service running, no scheduled backups will start.
This issue is resolved in VMware NSX 4.2.3.3 and 9.0.2, available at Broadcom downloads.
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Workaround
su admin -c get cluster status verbose | grep -E "Leaders\:|QuartzSetupServiceImpl"su admin -c get cluster status | grep <UUID returned in previous command>

If this is not your issue or does not address your issue, please see KB373896 for additional symptoms related to other issues and additional troubleshooting steps.