A full system backup should be performed before all major actions such as a system upgrade. The backup is not required as part of the actual upgrade (as was needed for the R22.214.171.124 to R11.1 GA upgrade process. However is an absolutely necessary provision in order to recover should issues occur in the R11.1 SP2upgrade process.
1.Having fully verified the operation of all services at R126.96.36.199, backup the R188.8.131.52 servers. See Creating a Back Up.