private void createRegion(final String regionName, final String diskStoreName) {
    PartitionAttributesFactory<Integer, String> partitionAttributesFactory =
        new PartitionAttributesFactory<>();
    partitionAttributesFactory.setTotalNumBuckets(5);

    RegionFactory<Integer, String> regionFactory =
        getCache().createRegionFactory(PARTITION_PERSISTENT);
    regionFactory.setDiskStoreName(diskStoreName);
    regionFactory.setPartitionAttributes(partitionAttributesFactory.create());
    regionFactory.create(regionName);
  }
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