Does ACM certificate renewal failure affect data stored in AWS services like Glacier?

ACM certificate expiration or renewal failure will not affect your data stored in AWS services like Amazon S3 Glacier or S3 buckets.

AWS Certificate Manager (ACM) is specifically designed to manage SSL/TLS certificates that secure HTTPS traffic to your domains and applications. When a certificate expires or fails to renew, it only impacts the TLS functionality of resources using that certificate, such as load balancers, CloudFront distributions, or API Gateway endpoints.

The underlying data stored in services like S3 or Glacier remains intact and accessible through other means (like the AWS Management Console, AWS CLI, or SDK calls that don't rely on the expired certificate). Certificate expiration affects only the secure communication channel that the certificate was protecting.

If your certificate expires, resources using it for TLS connections will stop working properly for HTTPS functionalities, but this has no impact on data persistence or integrity in storage services. To resolve the issue, you'll need to validate the domains by adding the required DNS CNAME records, or if the certificate has already expired, you'll need to request a new certificate and associate it with your resources.
Sources
SSL CERTIFICATE | AWS re:Post
HELP please! URG: SSL/TLS certificate from AWS Certificate Manager (ACM) in my AWS account expired | AWS re:Post