synchronized void backupFinished(Oplog oplog) {
    pendingBackup.remove(oplog);
    if (deferredCrfDeletes.remove(oplog)) {
      oplog.deleteCRFFileOnly();
    }
    if (deferredDrfDeletes.remove(oplog)) {
      oplog.deleteDRFFileOnly();
    }
  }
Add the oplog to the list of deferred deletes.

@return true if the delete has been deferred. False if this oplog should be deleted
        immediately.
geode-core/src/main/java/org/apache/geode/internal/cache/backup/DiskStoreBackup.java