Creating automatic scheduled backup copies of your Google Sheets using Google Apps Script

0-README.md

How to "Schedule Automatic Backups" of your Google Sheets

This tutorial demonstrates how to use Google Apps Script to:

• Create copies of the Google Sheet in the desired destination folder automatically at set intervals.

• Append the time stamp with each backup file's name.

• Adjust time trigger for backing up every day/hour/minute.

1-Config.md

1. Open your Google Drive and create a new folder right where your Google Sheet is. You may name it anything you like.

2. Open the folder you just created. You will be able to see its ID in the URL displayed in your browser's address bar. We will need this later.

3. Open your Google Sheet and select menu item "Tools" --> "Script Editor"

4. Once the script editor opens, copy and paste the code from the 2-MakeCopy.gs file (see file below) into the "Code.gs" file, replacing the code that's already included.

5. Copy the ID of the folder you created earlier and paste in place of the xxxxxxxxxxxxxxxxxxxxxxx in the code.

6. Go to menu "File" --> "Save".

7. Click on the clocked shaped "Trigger" button.

8. Click on the blue link to add a trigger.

9. Select the time interval as per your desire.

10. Click on "Continue" to authorize running the script you just made.

11. Click on "Allow" to let the script run on your Google Sheet.

12. After the set interval(which was every minute in my case), you can see the automatic scheduled backup copies of your Google Sheet saved in the folder you created.

2-MakeCopy.gs

// Abhijeet Chopra
// 26 February 2016
// Google Apps Script to make copies of Google Sheet in specified destination folder

function makeCopy() {

// generates the timestamp and stores in variable formattedDate as year-month-date hour-minute-second
var formattedDate = Utilities.formatDate(new Date(), "GMT", "yyyy-MM-dd' 'HH:mm:ss");

// gets the name of the original file and appends the word "copy" followed by the timestamp stored in formattedDate
var name = SpreadsheetApp.getActiveSpreadsheet().getName() + " Copy " + formattedDate;

// gets the destination folder by their ID. REPLACE xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx with your folder's ID that you can get by opening the folder in Google Drive and checking the URL in the browser's address bar
var destination = DriveApp.getFolderById("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

// gets the current Google Sheet file
var file = DriveApp.getFileById(SpreadsheetApp.getActiveSpreadsheet().getId())

// makes copy of "file" with "name" at the "destination"
file.makeCopy(name, destination);
}

Hey, here's my version of the script that lets you back up several files in the same parent backup folder, and keep x backups of these files (it creates a folder in the parent folder for each file you want to backup, and store the different versions of the file in this folder). It works with any file (not just sheets). To use it you just have to create a project and create a trigger for the run function.

Very usefull for me. Thanks @estebanthi !

Edit:
Just a mistake:
destination.removeFile(fileToDelete);
should be:
folder.removeFile(fileToDelete);

And may be could you clearFolder after each copy and avoid to retrieve destination folder:

const filesToBackup = [
   'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
   'yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy',
   'zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz'
];
const backupFolderId = 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb';  // folder id
const limit = 10;  // number of backups to keep

function run() {
   filesToBackup.forEach(fileId => makeCopy(fileId, backupFolderId));
}

function makeCopy(fileId, backupFolderId) {
   var file = DriveApp.getFileById(fileId);
   var backupFolder = DriveApp.getFolderById(backupFolderId);

   var timeZone = Session.getScriptTimeZone();
   var formattedDate = Utilities.formatDate(new Date(), timeZone, "yyyyMMddHHmm");
   var rootName = file.getName();
   var copyName = rootName + '_' + formattedDate;

   destination = getDestinationFolder(rootName, backupFolder);
   file.makeCopy(copyName, destination);
   clearFolder(destination);
}

function getDestinationFolder(rootName, backupFolder) {
   var children = backupFolder.getFoldersByName(rootName);
   if (!children.hasNext()) {
      var destination = DriveApp.createFolder(rootName);
      destination.moveTo(backupFolder);
   } else {
      var destination = children.next();
   }
   return destination;
}

function clearFolder(folder) {
   const files = folder.getFiles();
   const filesArray = [];
   while (files.hasNext()) {
      var file = files.next();
      filesArray.push(file);
   }

   filesArray.sort(function (a, b) {
      return b.getDateCreated() - a.getDateCreated(); // Sort in descending order of creation date
   });
   while (filesArray.length > limit) {
      var fileToDelete = filesArray.pop();
//      folder.removeFile(fileToDelete);   // doesn't really remove the file
      fileToDelete.setTrashed(true);
   }
}