switch tier.Type {
	case madmin.S3:
		d, err = newWarmBackendS3(*tier.S3, tier.Name)
	case madmin.Azure:
		d, err = newWarmBackendAzure(*tier.Azure, tier.Name)
	case madmin.GCS:
		d, err = newWarmBackendGCS(*tier.GCS, tier.Name)
	case madmin.MinIO:
		d, err = newWarmBackendMinIO(*tier.MinIO, tier.Name)
	default:

		if nextRenewal <= 0 {
			nextRenewal = float64(time.Second)
		}

		return time.Duration(nextRenewal)
	})

	return tc, nil
}

func newWarmBackendAzure(conf madmin.TierAzure, _ string) (*warmBackendAzure, error) {
	var (
		credential azblob.Credential
		err        error
	)

	switch {
	case conf.AccountName == "":