Urgent Linux scripting help

#!/bin/bash
 
function SystemSpecs {
  uname -a
}
 
function VmStats {
  vmstat
}
 
function MemStats {
  free
}
 
function FileSpace {
  du
}
 
function FreeSpace {
  df
}
 
function BackupSystem {
  echo Backup Started `date` >> ~/backuplog
  mkdir /mnt/usbdrive/backups/`date +%Y%m%d`
  tar -czf /mnt/usbdrive/backups/`date +%Y%m%d`/data.tar.gz /data
  echo Backup Completed `date` >> ~/backuplog
}
 
function ExitMessage {
  echo "Bye $USER"
}
 
function HdInfo {
  if [ -d /proc/ide/hda ]
  then
    echo -e "Hard disk information:"
    echo -e "--------------------------------------------------------------------"
    echo -e "Model: `cat /proc/ide/hda/model` "
    echo -e "Driver: `cat /proc/ide/hda/driver` "
    echo -e "Cache size: `cat /proc/ide/hda/cache` "
  fi
}
 
function CpuInfo {
  echo -e "--------------------------------------------------------------------"
  echo -e "Computer CPU Information:"
  echo -e "--------------------------------------------------------------------"
  cat /proc/cpuinfo
}
 
function CMemInfo {
  echo -e "--------------------------------------------------------------------"
  echo -e "Computer Memory Information:"
  echo -e "--------------------------------------------------------------------"
  cat /proc/meminfo
}
 
function FsInfo {
  echo -e "--------------------------------------------------------------------"
  echo -e "File System (Mount):"
  echo -e "--------------------------------------------------------------------"
  cat /proc/mounts
}
 
while :
do
 
  clear
  printf "|-------------------------------------------------------------|\n"
  printf "|       Choose which system information you need              |\n"
  printf "|-------------------------------------------------------------|\n"
  printf "\n"
  printf "1. Output System specifications\n"
  printf "2. Display Virtual memory statistics\n"
  printf "3. Display memory usage\n"
  printf "4. Estimate file space usage\n"
  printf "5. Display free disk space\n"
  printf "6. Backup files\n"
  printf "7. EXIT\n"
  printf "\n"
  printf "Enter a number between 1 and 7 and press [ENTER]: "
  read opt
  printf "\n"
 
 
  case "$opt" in
  1) 
      SystemSpecs
      ;;
  2) 
      VmStats
      ;;
  3) 
      MemStats
      ;;
  4) 
      FileSpace
      ;;
  5) 
      FreeSpace
      ;;
  6)
      BackupSystem
      ;;
  7) 
      ExitMessage
      exit 1
      ;;
  else)
    sleep 2
    clear
    ;;
  esac
 
  clear
done