Best practice resource group or normal backup job

Hi

what would i do with sql backup.I have sap server for quality sapq1,sapq2 and production sapp1,sapp2. All 4 servers have sepperatly volumes. 

all for servers should be backup on the same time at 2 o clock full db

i create a resource group quality which include sapq1 and sapq2 and resource group production which include sapp1 and sapp2.

but its this ok? Or should i make 4 seperate job each server one job.

seperrate job means that i can also make backup only of one server. But on another side at 2?o clock 4 jobs started normally by rg only 2

what is there best practice?