Made the following changes and it worked:

On Windows 7:

Start > Control Panel > Network Sharing Center > Advanced Sharing Settings:

Turn on network discovery
Turn on file and printer sharing
Turn on sharing so anyone with network access can read and write files
Use 128-bit encryption <<<< this is the setting I changed
Turn on password protected sharing
Allow Windows to manage homegroup connections <<<< this is the setting I changed

>
> The configuration settings are:
>
> $Conf{XferMethod} = 'smb';
> $Conf{SmbShareName} = 'Users';
> $Conf{SmbShareUserName} = 'someuser';
> $Conf{SmbSharePasswd} = 'somepasswd';
> $Conf{SmbClientPath} = '/usr/bin/smbclient';
> $Conf{SmbClientFullCmd} = '$smbClientPath \\\\$host\\$shareName
> $I_option -U $userName -E -N -d 1 -c tarmode\\ full -Tc$X_option -
> $fileList';
>

I also changed SmbClientFullCmd to:

$smbClientPath \\\\$host\\$shareName $I_option -U $userName -E -d 1 -c
tarmode\\ full -Tc$X_option - $fileList

(i.e., dropped the -N)

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