#! /usr/bin/bash

if [[ $UID != 0 ]]; then
  echo "Please run this using sudo"
  exit
fi

prefix=backup_apache2
fileName=$prefix-$(date +'%m-%d-%Y').tar.gz

dir=$(pwd)

echo "====== check number of old backup"
nBackup=$(ls -1 $prefix-* | wc -l)

echo "number of backup : ${nBackup}"

if [[ $nBackup -gt 3 ]]; then
   oldFile=$(ls -t $prefix-* | tail -1)
   echo "removing the old backup $oldFile"
   rm -f $oldFile
fi

echo "====== backup apache data"

cd /etc

tar -czf $fileName apache2/

ls -l $fileName

mv $fileName $dir/.

echo "backup saved to ${fileName}"