When I try to make a backup, it get out a message; Invalid vCenter status: Not all required services are active. Stopped services: 'vmware-postgres-archiver'.
I want to know, What is the service I should start?
@comunicaciones_ - Not sure why it isn't running, as that is an Automatic Service.
First thing to do is log into your VAMI interface (ie https://vcenter-url:5480) then click Services. On the Startup Type column, sort it in order, so it puts all of the Automatic services together, then check the State column to check which services that are set to Automatic, are not running. If its just the one service, it might be a blip, but its worth checking them all, in case there are other services affected.
The service you're looking for, regarding your query is this one, and it needs to be in a Started state. Simply select it and click Start at the top of the menu bar.
HTH