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Daily notification on the absence of an object on AWS S3 Prefix
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S3 Backup Notifier ✉️

s3 backup notifier intends to daily check the last object date in an AWS S3 bucket, and if it's older than today, send alerting email via AWS Simple Email Service (SES).

I'm using this to monitor the effectiveness of backup of my home automation systems and be alerted on any backup related issue.

Technical details

Fully serverless.

  • Uses AWS Lambda function (Python)
  • Rely on AWS Lambda layer for boto3 and botocore
  • Scheduled Lambda (daily) using CloudWatch Events
  • Uses AWS Simple Email Service (SES) for Emails Notifications



  • Configure AWS Credentials (prefer aws-vault)
  • Create a bucket called: <project_name>-artifacts (Prefer versioned and encrypted)

Its using AWS Serverless Application Model (SAM)


Build layer, and AWS Lambda function package.

$ make layer
$ make package


Deploy CloudFormation stack.

RECIPIENTS var is space separated

$ make deploy \
    PROJECT=<your_project_name> \
    ENV=<your_env> \
    MONITORING_BUCKET=<bucket_to_monitor> \
    S3_PREFIX=<s3_prefix> \
    SENDER=<sender_email> \
    RECIPIENTS='<recipient_email1> <recipient_email2>' \


Remove unused folders and files after the deployment of your the stack.

$ make cleaning


$ make tear-down
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