code: public RepositoryBackupChain findRepositoryBackupId(String backupId)
     {
        Iterator<RepositoryBackupChain> it = currentRepositoryBackups.iterator();
        while (it.hasNext())
        {
           RepositoryBackupChain chain = it.next();
           if (backupId.equals(chain.getBackupId()))
           {
              return chain;
           }
        }
        return null;
     }
docs: {@inheritDoc}