One of my "hobbies" was as at EMC Legato, supporting enterprise clients in the DR Business Continuity areas.
I have many thoughts, design ideas and comments floating around in my head....along with the voices! Oh those voices!!!

Ummm....back to the thread....

What is your budget going to support?
What is the amount of data you need to backup?
What is the backup window?
What is the infrastructure designed on - hubs or switches?
What software are you using to perform backups?

I would go LTO3, and we can discuss the details. There are many ways to get a bulletproof DR strategy without breaking the budget