private void createCache(final File diskDir, final File userDir) {
    CacheFactory cacheFactory = new CacheFactory(getDistributedSystemProperties())
        .set(DEPLOY_WORKING_DIR, userDir.getAbsolutePath());

    cacheRule.getOrCreateCache(cacheFactory);

    createDiskStore(diskStoreName1, diskDir);
    createDiskStore(diskStoreName2, diskDir);

    createRegion(regionName1, diskStoreName1);
    createRegion(regionName2, diskStoreName2);
  }
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