Bash backup

backup.sh

function backup_files() {
        _backup_file="template-backup-["`date +"%Y-%m-%d-%m"`"].tar.gz"
        echo 'Creating backup of:' $(pwd)
        tar -czf $HOME/$_backup_file . &>> install/install.log
        if [ $? -eq 0 ]; then
                echo 'Backup seems to be successful.'
        else
                echo 'Something went wrong, exit code:' $?
                echo 'Check ....'
        fi
}