AWS EC2 automatic volume daily/weekly/monthly snapshots.

readme.md

Credits: https://gist.github.com/Serhioromano/9738785

Fixing clock: sudo ntpdate us.pool.ntp.org

backup.php

#!/usr/bin/php -q
<?php
date_default_timezone_set('UCT');
$dryrun     = FALSE;
$volumes    = array('');
$api_key    = '';
$api_secret = '';
$ec2_region = 'us-east-1';

require 'aws/aws-autoloader.php';
use Aws\Ec2\Ec2Client;
$client = new Ec2Client(
    array(
        'credentials' => array(
            'key'    => $api_key,
            'secret' => $api_secret
        ),
        'version'     => 'latest',
        'region'      => $ec2_region
    )
);

/* * * * * * * * * * DAILY BACKUP START * * * * * * * * * */
$interval   = '24 hours';
$keep_for   = '3 Days';
$snap_descr = "Daily backup";
$db = json_decode(file_get_contents(__DIR__ . '/db_daily.json'), TRUE);
$snapshots = array();
foreach($db AS $key => $snapshot)
{
    if(!empty($snapshots[$snapshot['volume']]))
    {
        if($snapshot['time'] > $snapshots[$snapshot['volume']]['time'])
        {
            $snapshots[$snapshot['volume']] = $snapshot;
        }
    }
    else
    {
        $snapshots[$snapshot['volume']] = $snapshot;
    }
    if($snapshot['time'] < strtotime('- ' . $keep_for))
    {
        $client->deleteSnapshot(
            array(
                'DryRun'     => $dryrun,
                'SnapshotId' => $snapshot['id'],
            )
        );
        unset($db[$key]);
    }
}
foreach($volumes As $volume)
{
    if((!empty($snapshots[$volume])) && ($snapshots[$volume]['time'] > strtotime('-' . $interval)))
    {
        continue;
    }
    $result = $client->createSnapshot(
        array(
            'DryRun'      => $dryrun,
            'VolumeId'    => $volume,
            'Description' => $volume.' - '.$snap_descr,
        )
    );
    $db[] = array(
        'volume' => $volume,
        'time'   => strtotime($result['StartTime']),
        'id'     => $result['SnapshotId']
    );
}
file_put_contents(__DIR__ . '/db_daily.json', json_encode($db));
/* * * * * * * * * * DAILY BACKUP END * * * * * * * * * */



/* * * * * * * * * * WEEKLY BACKUP START * * * * * * * * * */
$interval   = '7 Days';
$keep_for   = '21 Days';
$snap_descr = "Weekly backup";
$db = json_decode(file_get_contents(__DIR__ . '/db_weekly.json'), TRUE);
$snapshots = array();
foreach($db AS $key => $snapshot)
{
    if(!empty($snapshots[$snapshot['volume']]))
    {
        if($snapshot['time'] > $snapshots[$snapshot['volume']]['time'])
        {
            $snapshots[$snapshot['volume']] = $snapshot;
        }
    }
    else
    {
        $snapshots[$snapshot['volume']] = $snapshot;
    }
    if($snapshot['time'] < strtotime('- ' . $keep_for))
    {
        $client->deleteSnapshot(
            array(
                'DryRun'     => $dryrun,
                'SnapshotId' => $snapshot['id'],
            )
        );
        unset($db[$key]);
    }
}
foreach($volumes As $volume)
{
    if((!empty($snapshots[$volume])) && ($snapshots[$volume]['time'] > strtotime('-' . $interval)))
    {
        continue;
    }
    $result = $client->createSnapshot(
        array(
            'DryRun'      => $dryrun,
            'VolumeId'    => $volume,
            'Description' => $volume.' - '.$snap_descr,
        )
    );
    $db[] = array(
        'volume' => $volume,
        'time'   => strtotime($result['StartTime']),
        'id'     => $result['SnapshotId']
    );
}
file_put_contents(__DIR__ . '/db_weekly.json', json_encode($db));
/* * * * * * * * * * WEEKLY BACKUP END * * * * * * * * * */



/* * * * * * * * * * MONTHLY BACKUP START * * * * * * * * * */
$interval   = '1 Month';
$keep_for   = '3 Months';
$snap_descr = "Monthly backup";
$db = json_decode(file_get_contents(__DIR__ . '/db_monthly.json'), TRUE);
$snapshots = array();
foreach($db AS $key => $snapshot)
{
    if(!empty($snapshots[$snapshot['volume']]))
    {
        if($snapshot['time'] > $snapshots[$snapshot['volume']]['time'])
        {
            $snapshots[$snapshot['volume']] = $snapshot;
        }
    }
    else
    {
        $snapshots[$snapshot['volume']] = $snapshot;
    }
    if($snapshot['time'] < strtotime('- ' . $keep_for))
    {
        $client->deleteSnapshot(
            array(
                'DryRun'     => $dryrun,
                'SnapshotId' => $snapshot['id'],
            )
        );
        unset($db[$key]);
    }
}
foreach($volumes As $volume)
{
    if((!empty($snapshots[$volume])) && ($snapshots[$volume]['time'] > strtotime('-' . $interval)))
    {
        continue;
    }
    $result = $client->createSnapshot(
        array(
            'DryRun'      => $dryrun,
            'VolumeId'    => $volume,
            'Description' => $volume.' - '.$snap_descr,
        )
    );
    $db[] = array(
        'volume' => $volume,
        'time'   => strtotime($result['StartTime']),
        'id'     => $result['SnapshotId']
    );
}
file_put_contents(__DIR__ . '/db_monthly.json', json_encode($db));
/* * * * * * * * * * MONTHLY BACKUP END * * * * * * * * * */
return;

db_daily.json

[]

db_monthly.json

[]

db_weekly.json

[]