1) Your backups take place via the drive caddies and are kept offsite and offline, correct?
Right. But the Primary archives are also in the caddies. It's a convenient way to configure the JBOD.
2) For this setup, is the Firewire or SATA JBOD used strictly as a backup bootup disk?
No. The JBOD is also the place the primary archive lives, as stated above. Actually, the backups of the Boot drives are on single Firewire drives. Partially because I had them, and they were convenient to use, partially because the program I use (Carbon Copy Cloner) only want to clone to a local firewire drive, not a drive accessible over ethernet.
3) I currently use a LAN to backup my local archive (which is on local harddrives) and the backed up archive remains resident on my LAN which extends to another building, which does make it susceptible to viruses. However, once I've migrated to your DAM system, I will also be burning bucket DVD's. Any opinions on keeping the backed up archive connected to the LAN even though it's in a separate building. The reason I ask, is because this is very convenient and doesn't require me to deal with caddies or external harddrives. I do realize there might be a slight virus risk; however, how common are viruses in image files which contain no code? Thanks.
If I understand what you are asking, I would say that you are pretty safe. Part of it depends on how vigilant you are with Virus Protection, and what platform you are on (fewer viruses for Macs). I would also say that part of the advantage of the Bucket System is that only the most recent *second* backup drive needs to be connected generally. Since the other drives contain image files that have already been backed up and put away, you only need to pull those out for periodic file integrity check and file update.