Question : Problem: Recommendations for backup hardware/software for MAC's

I work in a small office and we have two graphic designers who are currently backing up their files on an external drive in the office (1 TB currently)

I would like to look into backing up these files offsite (either to another office in a different location) or to an online site.

Cost is a concern.  

Computers being backed up to external drive within office:

Mac Pro 2.66 GHz Dual-Core Xeon
Mac Pro  Two 3.0GHz Quad-Core Intel Xeon

Any suggestions on hardware/software/ offsite vendor.  We are most concerned about protecting our archived files and keeping them reasonably accessible.

Answer : Problem: Recommendations for backup hardware/software for MAC's

there are few softwares available that can achieve the task, kindly check below link

http://www.pure-mac.com/backup.html

regarding hardware, you can get a single LTO4 tape drive with compression enabled so that you can backup upto 1600 GB of data, there are few players who are reputed in doing it

HP, Quantum and dell can work it out.

i dont think you need to get an offsite vendor involved as this is much simpler process of performing a backup.