I've noticed lately that when a backup is occurring, my system gets really slow. Like, so slow that I sometimes wind up canceling the backup out of frustration. Is this normal? (I have a 2.4 GHz Core 2 Duo MBP, 4 GB RAM) At the same time, the backup drive seems to have gotten rather noisy during backups. It has a second partition that I use for recording/watching TV (with an EyeTV), and it's quiet as a mouse. What gives?