In both version 7 and 8, synchronization of RoboForm Data is not mandatory and can be turned off.
In Version 7, a user who does not wish to sync can run the software in Desktop mode.
RoboForm 7 in Desktop mode does not require setting up an account, only selecting a Master Password.
Version 7 in Everywhere mode requires creating a RoboForm Online account in order to sync. This is comprised of a username and RoboForm Online password (which can be the same or different than the Master Password).
RoboForm 8 requires the creation of a RoboForm Account comprised of an email and Master Password.
In Version 8, turning off sync is done by clicking the RoboForm taskbar icon -> Sync -> Turn Off Sync