Safe to stop VCenter Server Services on appliance?

I need to make a manual backup of the POSTGRES DB due to stale licenses issue.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2054008

To do this I need to take a manual backup of the DB prior to making changes which requires I stop the VMware Server Services on the appliance. What are the possible issues with stopping these services?