All states are lockers, so get rid of extra asertions.
Remove CacheState rather than update it, since it's no longer used.
Not really a problem, but created unnecessary files and changes existing behavior.
Add the LockUnlock methods to LocalState and BackupState. The implementation for LocalState will be platform specific. We will use OS-native locking on the state files, speficially locking whichever state file we intend to write to.
James Bardin