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For back-out purposes, it is highly recommended that a database backup of the database be taken using standard tools like RMAN for Oracle. Another option would be to export the FD, FD_ADMIN, and FF schemas using data pump. The schemas can be exported using the following data pump command for Oracle as shown below. Follow standard procedures for PostgreSQL and MySQL for database backup.

You will need to setup environment variables before running expdp. For example,

export ORACLE_HOME=/u01/app/oracle/product/12.1.0/dbhome_1
export ORACLE_SID=fd01

expost statements above are for example only as values will be different for your installation. 

expdp system directory=DATA_PUMP_DIR dumpfile=fd_bkup.dmp schemas=FD,FF,FD_ADMIN

If this database is exclusively used for just FlexDeploy application, you can rely on Database backup and recovery processes (RMAN) 
instead of export data procedure.

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Step 4. From the FlexDeploy Tomcat distribution, copy /apache-tomcat-flexdeploy/webapps/flexdeploy.war into <FlexDeploy Home>/apache-tomcat-flexdeploy/webapps (overwrite existing file). If you want to take backup of existing file, please copy it outside of FlexDeploy installation folder to avoid confusion later. If you keep copy of older war in webapps folder, then two applications will start and cause issues as well.

Step 5. Review context.xml changes as per FlexDeploy 5.2 Release Notes - See Platform Recommendations.

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