public Builder setManagedBackupSource(
        com.google.cloud.memorystore.v1.Instance.ManagedBackupSource.Builder builderForValue) {
      if (managedBackupSourceBuilder_ == null) {
        importSources_ = builderForValue.build();
        onChanged();
      } else {
        managedBackupSourceBuilder_.setMessage(builderForValue.build());
      }
      importSourcesCase_ = 24;
      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