Compress Files on your host if you don't have cpanel or ssh

compress_files

<?php

$time_stamp=time();
/*
 * Set $archive and $directory path accordinging to your host
 */ 
$archive = "../tmp/backup_{$time_stamp}.tar"; 
$directory = "../html/"; 
print "starting...";
exec( "tar cf $archive $directory 2>&1 ",$retArr, $retVal);
// print_r($retArr);
// print_r($retVal);

exec( "gzip $archive 2>&1",$retArr, $retVal);
// print_r($retArr);
// print_r($retVal);
print "Done.";