private void validateBackupStatus(final BackupStatus backupStatus) {
    Map<DistributedMember, Set<PersistentID>> backupMap = backupStatus.getBackedUpDiskStores();
    assertThat(backupMap).isNotEmpty();

    for (DistributedMember member : backupMap.keySet()) {
      assertThat(backupMap.get(member)).isNotEmpty();
      for (PersistentID id : backupMap.get(member)) {
        assertThat(id.getHost()).isNotNull();
        assertThat(id.getUUID()).isNotNull();
        assertThat(id.getDirectory()).isNotNull();
      }
    }
  }
Successful if a member performs a full backup when its backup data is not present in the
performBackupBaseline (for whatever reason). This also tests what happens when a member is
offline during the performBackupBaseline backup.

<p>
The test is regarded as successful when all of the missing members oplog files are backed up
during an performBackupIncremental backup. This means that the member performed a full backup
because its oplogs were missing in the performBackupBaseline.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/backup/IncrementalBackupDistributedTest.java