public Builder clearManagedBackupSource() {
      if (managedBackupSourceBuilder_ == null) {
        if (importSourcesCase_ == 24) {
          importSourcesCase_ = 0;
          importSources_ = null;
          onChanged();
        }
      } else {
        if (importSourcesCase_ == 24) {
          importSourcesCase_ = 0;
          importSources_ = null;
        }
        managedBackupSourceBuilder_.clear();
      }
      return this;
    }
<pre>
Optional. Immutable. Backups that generated and managed by memorystore
service.
</pre>

<code>
.google.cloud.memorystore.v1.Instance.ManagedBackupSource managed_backup_source = 24 [(.google.api.field_behavior) = OPTIONAL, (.google.api.field_behavior) = IMMUTABLE];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/Instance.java