This is your judgment call. If someone files a patent on your back-end before you do, you risk expensive legal fees down the road proving that you were the first to use the technology. A valuable patent covers more than an exact rendition of your back-end, it may cover general architecture and inter-component operation and functionality, without covering all the implementation details. Provisionals help build a fence around your technology.
Yuri Eliezer heads the intellectual property practice group at Founders Legal. As an entrepreneur who saw the importance of early-stage patent protection, Yuri founded SmartUp®. Clients he has served include Microsoft, Cisco, Cox, AT&T, General Electric, the Georgia Institute of Technology, and Coca-Cola.
Source: Smartup Legal