Amanda/Zmanda may be an alternative to bacula, but it I'm guessing that you are looking for something other than an equivalent system.
The answer to your question requires... a more detailed question. ;-)
I'm going to guess that by saying overly-complicated, you are really looking for a less complicated solution. And, this would imply that your needs don't match your solution.
If you enumerate your needs, you can A) focus your own research starting somewhere like http://en.wikipedia.org/wiki/List_of_backup_software and B) expect more thorough answers to your question.
I've administered Legato and I've done some work with both Amanda and bacula. They are all essentially the same solution with differing implementation details. Do you need something more radically different? Maybe try a solution like Crashplan? This will require you to fill out your question even further to explore your comfort levels with proprietary formats and cloud services and their related security implications. In order to get something very different from traditional centralized network backup software, you are going to need to figure this out anyway.
In short, you need a list of requirements (when don't you?) and some way of evaluating risks and rewards. Multiply that by the power of Server Fault and you should have something you can take back to the team to look at.