I read the entire article, and while you talked about having a backup system (in a single server, no less!) that can restore your dataset in a reasonable amount of time, you have no capability for disaster recovery. What happens when a plumbing leak in the datacenter causes water to dump into your server racks? How long did it take you to acquire servers, build the racks and get them ready for you to host customer data? Can your business withstand that amount of downtime (days, weeks, months?) and still operate?

These questions are the ones you need to be asking.

In other words, double your budget because you'll need a DR site in another datacenter.