private File findBaselineForThisMember(Path baselineParentDir, DiskStore diskStore) {
    File baselineDir = null;

    // Find the first matching DiskStoreId directory for this member.
    File[] matchingFiles = baselineParentDir.toFile()
        .listFiles((file, name) -> name.endsWith(getBackupDirName((DiskStoreImpl) diskStore)));
    // We found it? Good. Set this member's baseline to the backed up disk store's member dir (two
    // levels up).
    if (null != matchingFiles && matchingFiles.length > 0) {
      baselineDir = matchingFiles[0].getParentFile().getParentFile();
    }

    return baselineDir;
  }
Performs a sanity check on the baseline directory for incremental backups. If a baseline
directory exists for the member and there is no INCOMPLETE_BACKUP_FILE file then return the
data stores directory for this member.
geode-core/src/main/java/org/apache/geode/internal/cache/backup/FileSystemIncrementalBackupLocation.java