We do not offer remote wipe. SpiderOak One and Groups are designed to keep your data secure while in the cloud and in transit between devices. Securing locally stored data from local attackers is important but is not what our products are designed for.
There is an excellent open source project called Prey that you may want to consider. It can remote wipe a stolen device, as well as help you or the police find the location of a stolen device. We are not affiliated with the Prey project, but it will work well in combination with our products.