Google Apps Script that removes Wordpress backups stored in Google Drive

removeWPBackups

/* 
Script to remove older Wordpress backup files from Drive
http://wordpress.org/plugins/wp-google-drive/
Only two latest versions are kept in Drive thru main() param
Philippe Creytens - 2014-01-21
*/

function deleteOlderBackupFiles(files, numberToKeep){
  var quantity = files.length;
    //delete files
    for (var j=0; j < quantity; j++){
      if (j >= numberToKeep) {
        var removeFiles = DriveApp.getFilesByName(files[j].name);
        while (removeFiles.hasNext()) {
          var file = removeFiles.next();
          Logger.log(files[j]);
          file.setTrashed(true);
        }
      }
    }
}

/* Get all files and push on to stack as key:value */
function retrieveBackupFiles() {
  var files = DriveApp.searchFiles('title contains "Backup-WP"');
  var result = []
  while (files.hasNext()) {
   var file = files.next();
    result.push({name:file.getName(),date:file.getDateCreated()});
  }
  //sort by date descending
  result.sort(function(a, b){
    var dateA=new Date(a.date), dateB=new Date(b.date)
    return dateB-dateA // dateA-dateB is ascending
  })
  return result;
}

/* main function is scheduled on interval daily between 6-7 AM */
function removeWPBackups() {
  files = retrieveBackupFiles();
  // Keep two backups
  deleteOlderBackupFiles(files,2);
}