Bucket       string
	Prefix       string
	StorageClass string
}

func (az *warmBackendAzure) tier() *blob.AccessTier {
	if az.StorageClass == "" {
		return nil
	}
	for _, t := range blob.PossibleAccessTierValues() {
		if strings.EqualFold(az.StorageClass, string(t)) {
			return &t
		}
	}
	return nil
}

func (az *warmBackendAzure) getDest(object string) string {
	destObj := object
	if az.Prefix != "" {