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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
export 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.