protected internal abstract void SetActiveBackup(IndexBackup backup, IndexBackup lastBackup);
protected internal abstract void StoreBackupStream(string backupFilePath, IndexBackup backup, IndexBackupProgress progress);
protected internal abstract void SetActiveBackup(IndexBackup backup, IndexBackup lastBackup);
protected internal abstract void StoreBackupStream(string backupFilePath, IndexBackup backup, IndexBackupProgress progress);