I have SharePoint production and staging environment where production has build version of 14.0.7015.1000 & staging has 14.0.7125.5000. I had observed there are two additional hot fixes applied on staging(February 2014 CU, June 2014 CU for SharePoint 2010) which were not present in production environment.
How do I make production build version same as staging. Does installing above CU will make both the farms at same build version? .
Do I need to install just June 2014 CU on production or I need to install first February CU and then June 2014 CU?
I have 3 WFE, Should I install the CU at different time on each WFE? What would be down time?
Do I need to do any backup, what is way to restore if something doesn't work after installation of CU?