The Informant application nor any of its sync services sync the contacts.  The contacts that are visible in Informant are provided by the device.  The device will share its contacts database with the Informant application.  

The device is responsible for syncing, storing and backing up the contacts and Informant is only presenting the contacts as the device is presenting them to it.

Please contact your device vendor for support on syncing of the contacts.  Once the contacts are visible in the devices own contacts application they should be available in the Informant application.