In today’s digital era, data is a critical asset for businesses of all sizes. Automated backup to S3 (Simple Storage Service) is a highly effective way to protect your data from loss or corruption. S3 is a secure, scalable, and durable object storage service that offers virtually limitless storage space.

Benefits of Automated Backup to S3

There are numerous benefits:

  • Reduced risk of data loss: Automated backups ensure that your data is regularly backed up, minimizing the risk of data loss due to hardware failure, software corruption, or human error.
  • Increased data security: S3 offers a high level of data security, with features such as encryption, access control lists (ACLs), and versioning.
  • Improved disaster recovery: In the event of a disaster, automated backups can be used to quickly restore your data to a previous state.
  • Reduced administrative overhead: Automated backups can be scheduled to run unattended, freeing up your time for other tasks.
  • Cost-effective: S3 is a cost-effective storage solution, with pricing based on the amount of data you store.

How It Works

Automated file backup to S3 with Lambda works by using a Lambda function to trigger the backup process. When a file is added to a designated S3 bucket, the Lambda function is invoked. The Lambda function then copies the file from the S3 bucket to a local directory. Once the file has been copied, the Lambda function can perform any additional tasks, such as compressing or encrypting the file. The file is then uploaded to a designated S3 bucket for safekeeping.


Implementing it with Lambda is a relatively straightforward process.

  1. Create S3 bucket.

2. Create an IAM role for Lambda. Go to IAM Console and create new role with following trust policy

    "Version": "2012-10-17",
    "Statement": [
            "Effect": "Allow",
            "Action": [
            "Principal": {
                "Service": [

3. Create a Lambda function. Make sure to select existing role that we have created in step 2.

4. Add the Lambda function code.


import boto3

def lambda_handler(event, context):
  This Lambda function will backup files from a local directory to an S3 bucket.

  s3 = boto3.client('s3')

  # The name of the S3 bucket to backup files to.
  bucket_name = 'your-bucket-name'

  # The local directory to backup files from.
  local_directory = '/tmp/files-to-back-up'

  # Get a list of files in the local directory.
  files = os.listdir(local_directory)

  # Upload each file to the S3 bucket.
  for file in files:
    s3.upload_file(os.path.join(local_directory, file), bucket_name, file)

5. Configure a trigger for the Lambda function. Based on your requirement you can trigger this lambda function. For example, lambda function runs daily at fixed time to copy the files to s3 bucket

6. Test the Lambda function.

Benefits of Using Lambda for Automated File Backup to S3

There are several benefits to using Lambda for automated file backup to S3:

  • Serverless: Lambda is a serverless compute service, which means that you do not need to provision or manage servers. This can save you time and money.
  • Scalable: Lambda is a highly scalable service that can automatically scale up or down to meet the demands of your workload.
  • Event-driven: Lambda can be triggered by events such as changes to S3 objects. This makes it ideal for use with automated file backup.

S3 Replication Service: An Alternative to Lambda for Automated File Backup

In addition to using Lambda for automated file backup to S3, you can also use the S3 Replication service. S3 Replication is a built-in feature of S3 that allows you to automatically replicate objects between S3 buckets.

To use S3 Replication for automated file backup, you would create a replication rule that replicates objects from a source bucket to a destination bucket.


Automated file backup to S3 with Lambda is a powerful and versatile solution for protecting your data. By using Lambda, you can create a fully automated backup solution that is both scalable and cost-effective.

If you are looking for a reliable and secure way to protect your data, then automated file backup to S3 with Lambda is a great option.