Oracle Home and GRID backup command

Create a directory to the target where you wish to take the backup as 

mkdir abc
cd abc
mkdir backup
cd backup

pwd

/abc/backup

Now set the ASM environment and execute as root user for GRID backup

tar -cvpf /abc/backup/abc_GRIDBKP.tar $ORACLE_HOME 

and for RDBMS set any DB environment and as a oracle user 

tar -cvpf /abc/backup/abc_RDBMSBKP.tar $ORACLE_HOME  $ORACLE_HOME