Incremental backup system file shell script

Today to write a shell script using an incremental backup system files, incidentally review the relevant shell script commands, the script according to their different needs to back up files or folders, complete and incremental backups. Direct the script as follows:

#!/bin/sh
#Automatic Backup Linux System Files
#Author wugk 2013-11-22
#Define Variable
SOURCE_DIR=(
    $*
)
TARGET_DIR=/data/backup/
YEAR=date +%Y
MONTH=date +%m
DAY=date +%d
WEEK=date +%u
FILES=system_backup.tgz
CODE=$?
if
    [ -z "$*" ];then
    echo -e "Please Enter Your Backup Files or Directories\n--------------------------------------------\nExample $0 /boot /etc ......"
    exit
fi
#Determine Whether the Target Directory Exists
if
    [ ! -d $TARGET_DIR/$YEAR/$MONTH/$DAY ];then
    mkdir -p $TARGET_DIR/$YEAR/$MONTH/$DAY
    echo "This $TARGET_DIR is Created Successfully !"
fi
#EXEC Full_Backup Function Command
Full_Backup()
{
if
    "$WEEK" -eq "7" ];then
    rm -rf $TARGET_DIR/snapshot
    cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $FILES echo ${SOURCE_DIR[@]}
    "$CODE" == "0" ]&&echo -e  "--------------------------------------------\nThese Full_Backup System Files Backup Successfully !"
fi
}
#Perform incremental BACKUP Function Command
Add_Backup()
{
   cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;
if
    [ -f $TARGET_DIR/$YEAR/$MONTH/$DAY/$FILES ];then
    read -p "These $FILES Already Exists, overwrite confirmation yes or no ? : " SURE
    if [ $SURE == "no" -o $SURE == "n" ];then
    sleep 1 ;exit 0
    fi
#Add_Backup Files System
    if
        [ $WEEK -ne "7" ];then
        cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $$_$FILES echo ${SOURCE_DIR[@]}
        "$CODE" == "0" ]&&echo -e  "-----------------------------------------\nThese Add_Backup System Files Backup Successfully !"
   fi
else
   if
      [ $WEEK -ne "7" ];then
      cd $TARGET_DIR/$YEAR/$MONTH/$DAY ;tar -g $TARGET_DIR/snapshot -czvf $FILES echo ${SOURCE_DIR[@]}
      "$CODE" == "0" ]&&echo -e  "-------------------------------------------\nThese Add_Backup System Files Backup Successfully !"
   fi
fi
}
Full_Backup;Add_Backup

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