Backup Alternative

Here is my situation....I work for a small financial organization...actually, it is a state chartered credit union with four seperate branches and 50 employees.... Currently...each branch, and each department at our administrative branch has a 60GB external hard drive that we backup our individual email account and PC's to each month....can anyone offer any advice or suggestions on a better or more secure backup/recovery system for a small organization such as this....I am currently looking at an online systems called SOS...any comments on that would also be appreciated.