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The issue you're experiencing with the disabled copy button for RDS snapshots created by AWS Backup in another region is a known limitation. AWS Backup does not support directly copying these snapshots using the RDS console's copy feature. This is because AWS Backup manages its own recovery points, which are separate from standard RDS snapshots.
To resolve this and test your backup in another region (like Ireland), you have a few options:
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Use AWS Backup to create a copy: Instead of trying to copy the snapshot from the RDS console, you should use AWS Backup to create a copy of the recovery point in your backup vault. This can be done by selecting the recovery point in AWS Backup and initiating a copy operation to the desired region.
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Restore from AWS Backup: You can restore the database from the AWS Backup recovery point in the current region, and then use standard RDS methods to create a copy or replica in Ireland.
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Cross-region copy in AWS Backup: If you need regular copies in Ireland, consider setting up a backup plan in AWS Backup that includes a cross-region copy rule. This will automatically create copies of your backups in the specified region.
It's important to note that AWS Backup and RDS snapshots work somewhat independently. The snapshots created by AWS Backup are managed differently and have some limitations compared to manual RDS snapshots, which is why you're seeing the copy button disabled in the RDS console.
If you need to frequently test or use these backups in other regions, it may be beneficial to adjust your backup strategy to include cross-region copies as part of your AWS Backup plan, rather than trying to manually copy them after the fact.
Sources
Copy snapshot disable | AWS re:Post
Copy manual or system rds snapshot to AWS Backup vault | AWS re:Post
AWS Backup and RDS Multi AZ Cluster | AWS re:Post
