BackupResource does not support RDS Aurora databases.

public static fromRdsDatabaseInstance(instance: IDatabaseInstance): BackupResource

however the type IDatabaseInstance does not encompass Aurora databases. I believe additional methods are
needed to support these additional types:

IDatabaseCluster
IServerlessCluster

Additionally, BackupResource::fromConstruct() ignores Aurora databases even though they are supported by AWS Backup.

Use Case

There is no obvious way to backup Aurora databases from the CDK even though AWS Backup fully supports them.

The escape-hatch like BackupResource::fromArn() is an effective workaround.