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Looks like it was only added to TF recently. Let me check

Thanks Piers.

Yes it's there in the latest version of the provider, but our docs haven't caught up it seems. In typescript:

const fs = new aws.efs.FileSystem("fs");

const backup = new aws.efs.BackupPolicy("backup", {
    fileSystemId: fs.id,
    backupPolicy: {
        status: "ENABLED"
    }
});

Great, thanks for looking Piers.