With the Drobo up and running, I'm feeling a little safer. Right now, I have about 2 TB of disk space, which gives me just under 1 TB of available disk space. Of that space, I've used about half.
Overall, I'm very happy with the system. The largest drawback in this version of the Drobo is the USB 2. USB 2 is painfully slow compared to Firewire and SATA. However, in the way I'm using the system, the slow speed is tolerable.
The real test of the Drobo would be a hard drive failure. Sorry, I'm not going to even try to simulate that! Regardless, it will stay a part of the data protection plan for some time.