For the small business, this is a solution to consider.
Norton Online Backup is launching version 2.0 today. 1.0 was nothing to sneeze at, as well. However, starting today there is support for Mac (with Intel innards). Also new, users can share files via links to a Norton download page and can also save files while they are open and in use. Cool!
For $50, you can store up to 25GB of data using up to five computers.
There's a free 30 day trial.
The user interface makes a lot more sense than those frustrating pop-ups on the security suite by the way. Perhaps the Norton Online Backup team could have a chat with the Norton Security team about that one.