Service pack upgrade on 4.1
We are planning an service pack upgrade from 4.1 sp2 patch 2 to 4.1 sp5. I have went through many posts and blogs, but was not clear from installation, backing up users groups, servers(Ours is a clustered environment). I would like to hear from you what are the steps to perform this SP upgrade and how to upgrade? Right after downloading the software. Appreciate your valuable time spending on this post.