Offsite Multi TB Backup Solution?

[Kimball Larsen]

Our company has grown to the size that we'd like to have offsite  
backup of all the computers in the office, and all the servers in our  
rack.  We currently maintain backups locally, but want to know if  
there are cost-effective and efficient solutions for offsite backup  
for extra redundancy (i.e., if our building burned to the ground, we'd  
be in a world of hurt).

Thoughts?

Thanks!

- Kimball
http://www.kimballlarsen.com