AWS Cross-Region Backup

To delete EBS snapshots and AMIs in eu-west-2 and eu-west-3 after disabling cross-region copy, you'll need to follow these steps:

1. For EBS snapshots:

• Use the Amazon EBS console, AWS CLI, or SDKs to delete the snapshots in eu-west-2 and eu-west-3.
• You can delete snapshots one at a time through the console or use AWS SDKs to delete multiple snapshots at once.
• Be aware that you cannot delete snapshots that are less than 60 days old, used by AMIs, or managed by AWS Backup service using the standard deletion process.

2. For AMIs:

• First, you need to deregister the AMIs in eu-west-2 and eu-west-3.
• After deregistering the AMIs, you can then delete the associated EBS snapshots.

Important considerations:

• You cannot delete snapshots of the root device of an EBS volume used by a registered AMI. Deregister the AMI first.
• Snapshots managed by AWS Backup service must be deleted using AWS Backup, not through Amazon EC2.
• If a snapshot is still in progress, the deletion will only take effect after the snapshot completes.
• Snapshots in the Recycle Bin may be retained based on retention rules instead of being immediately deleted.
• You cannot delete snapshots associated with disabled EBS-backed AMIs without first enabling and then deregistering the AMI.

Remember to check both eu-west-2 and eu-west-3 regions separately when performing these operations, as each region will have its own set of snapshots and AMIs to manage.
Sources
EBS Snapshot | Delete - AMS Advanced Change Type Reference
Delete an Amazon EBS snapshot - Amazon EBS
Retaining Amazon EC2 AMI snapshots for compliance using Amazon EBS Snapshots Archive | AWS Storage Blog