execFunc() {
  cat <<-EOF

1. Backup App 1
2. Backup App 2
3. Backup App 3
4. Backup Everything

Option:
EOF
}

while :
 do
  execFunc;
  read -r choice

  case $choice in
   1) backupApp1;;
   2) backupApp2;;
   3) backupApp3;;
   4) backupEverything;;
   *) exit;;
  esac
done