Personally I use Puppet to handle configuration of all my systems. All code is on git/hg on codebasehq.com. This means that I don't need to backup entire system

Personally I use Puppet to handle configuration of all my systems. All code is on git/hg on codebasehq.com. This means that I don't need to backup entire systems, only databases and other user created content (which I use tarsnap for).