Enable S3 Object Lock on the relevant S3 buckets to prevent deletion for 7 years.

Create a lifecycle policy for the S3 buckets to transition objects to Glacier after 6 years and then delete them after 7 years.

Use AWS Backup to create a backup plan for the S3 buckets with a 7-year retention period.

Configure the S3 Lifecycle policy to move objects to Glacier Deep Archive after 1 year and then delete them after 7 years.