Using old version of wallet.dat

[torusJKL]

I have a wallet.dat which generated a Bitcoin address.
I successfully sent Bitcoins to this address.

Before using the wallet.dat I stored it in a save location.

If I now use the stored wallet.dat my Balance is 0.00 but if I move the current wallet.dat back to the bitcoin app folder my Balance is ok.

Is it possible to retrieve the new balance with the previously stored wallet or do I have to backup my wallet every time a change in Balance has been made?

[int_main]

Try running the client with the "-rescan" parameter.

[torusJKL]

Thanks.
It worked. Had to be a bit patient until it came up.