I also have the same problem which is why I deactivated BWPS. I got more than 20 backups a day emailed to me when I had wp-dbmanager installed. Even when I deactivated wp-dbmanager, I still got the same number of backups. The reason why I like the other plugin installed too is that it can email me a backup AND send one via email.
Can this be an added feature to BWPS, that backups can be stored on the server and a copy emailed? I’m just paranoid and want 2 copies daily since a friend of mine has been hacked recently. With the current BWPS you can only choose whether your backup copy is to be stored OR emailed, correct?