Robo task runner backup Task and configuration files for Drupal 8, Drush 9 with a composer based workflow.

RoboConfig.php

<?php
#### Configuration for MEOS Drupal 8 Backups with RoboFile

## Site URI
$siteuri='example.com';

## Folder where you want backups to be stored remotely. No trailing slashes!
$remotebackupbasepath='/home/user/backups/squidixvps';

## Remote backup user and server in the form of user@server
## If you have an alias in your ~/.ssh/config file you can use that here too.
## NOTE: We do not plan to handle passwords for login.
## You will need to setup passwordless login using ssh keys.
$remotebackupuserandserver='backupserver';

## Path to default PHP to used
## We do this as some jailshells do not run through our .bashrc or .profile files
## because of this the environmental variable DRUSH_PHP does not get set.
## We will set it in the script if this variable is set.
// $defaultpathtophp='/opt/cpanel/ea-php70/root/usr/bin/php';

RoboFile.php

<?php
/**
 * This is project's console commands configuration for Robo task runner.
 *
 * @see http://robo.li/
 */

class RoboFile extends \Robo\Tasks
{
  use \Boedah\Robo\Task\Drush\loadTasks;
  
  function backup()
  {
    include 'RoboConfig.php';
    $dateofbackup = date('o-m-d-W-w-His'); // yyyy-mm-dd-Week number-day of week-HHMMSS
    $filename = $siteuri . '-' . $dateofbackup;
    exec('drush status', $drushinfo);
    $gitbranch = exec('git rev-parse --abbrev-ref HEAD');
    $gitinfo = exec('git describe --always $gitbranch');
    $this->stopOnFail(true);
    $collection = $this->collectionBuilder();
    $tmpPath = $collection->tmpDir();
    $archiveFile = '/tmp/'. $siteuri . '/' . $filename . '.tar.gz';
      $collection->taskFilesystemStack()
        ->taskDrushStack()
        ->drush('sql:dump --result-file=' . $tmpPath . '/' . $filename . '.sql')
        ->drush('drush cr')
        ->drush('drush csex excluded')
        ->run();

      //  Task to create manifest here
      $collection->taskWriteToFile($tmpPath . '/' . 'MANIFEST.ini')
        ->line('[Global]')
        ->line('siteuri = ' . $siteuri)
        ->line('datestamp = ' . $dateofbackup)
        ->line('gitbranch = ' . $gitbranch)
        ->line('gitinfo = ' . $gitinfo)
        ->line('generator = MEOS Robo Backup')
        ->line('')
        ->line('[Drush Status]')
        ->lines($drushinfo)
        ->run();

      //  Copy files to temporary directory in preparation for archiving.
      $collection->taskCopyDir(['../../private' => $tmpPath . '/private']);
      $collection->taskCopyDir(['../../shared' => $tmpPath . '/shared']);
      $collection->taskCopyDir(['../../.dep' => $tmpPath . '/.dep']);
      $collection->taskCopyDir(['config/excluded' => $tmpPath . '/current/config/excluded']);

      //  Create folder for and then tar.gz archive of backup.
      $collection->taskFilesystemStack()
       ->mkdir('/tmp/'. $siteuri)
       ->run();
      $collection->taskExecStack()
        ->exec('tar --dereference -czf ' . $archiveFile . ' -C ' . $tmpPath . ' .')
        ->completion($this->taskDeleteDir($tmpPath))
        ->run();

      //  scp backup to remote backup server.
      $collection->taskExecStack()
       ->exec('scp ' . $archiveFile . ' ' .  $remotebackupuserandserver. ':' . $remotebackupbasepath . '/')
       ->completion($this->taskDeleteDir('/tmp/'. $siteuri))
       ->run();

  $collection->run();
  }
}