Concurrent Operations Registery Key

Hi,

I have a problem that my backup server is only doing 1 concurrent backup-to-disk at a time. I changed the option from options>Backup-to-Disk> Concurrent operations to 4 and still it is doing them 1 at a time.

By any chance is there a registery key which I can go and check and arrange it manually since I am suspecting that the problem is that the key is not updated?

Thanks and Regards,

A