> but I worry about MongoDB since data in this application is critical and loss would be catastrophic Don't worry, this is just some old and well debated preju

> but I worry about MongoDB since data in this application is critical and loss would be catastrophic Don't worry, this is just some old and well debated prejudice against Mongo (don't want to start a mongo discussion here though). Mongo has five different safe write modes you can choose from plus optional journaling and is in general some of the most impressive piece of tech and the best document store I know. Just try it and you won't go back and it's popular: http://www.google.com/trends/explore#q=mongodb%2C%20postgres%2C%20couchdb%2C%20riak%2C%20&cmpt=q http://www.google.com/trends/explore#q=mongodb%2C%20postgres...