anchor.diff:  		Tables :: Table | [Table],
   		Table :: atom() | string(),
   		File :: string().
  -%% @doc Create a backup of the named table(s) in `File.BUPTMP'.
  +%% @doc Create a backup of the named table(s) in `File'.
   %%
   backup([H | _ ] = Tables, File) when is_list(H) ->
   	backup([list_to_existing_atom(T) || T <- Tables], File);
  
positive.code: 	end,
  	case mnesia:transaction(F) of
  		{atomic, ok} ->
  			add_resource(Table),
  			ok;
  		{aborted, Reason} ->
  			exit(Reason)
  
negative.code: %%  internal functions
  %%----------------------------------------------------------------------
  
  -spec insert(Table, Number, Value, []) -> {NumWrites, #gtt{}}
  	when
  		Table :: atom(),
  