If you only lost your Storm two days ago, why do you not know your password? If you stopped using a password some time ago, do you have a more recent backup? If you have upgraded your OS, that will have made a backup as well.
I've never tried to restore a password-protected backup on a different device. If it worked, it would be a huge hole in RIM's security. You have nothing to lose by trying it, but I don't think you will be successful. There is no way to recover a password other than to remember it.