There doesn't appear to be much in the way of documentation for incremental checkpointing other than how to turn it on. That leaves a lot of questions unanswered.
What is the interaction of incremental checkpointing and external checkpoints? Any interaction with the state.checkpoints.num-retained config? Does incremental checkpointing require any maintenance? Any interaction with savepoints? Does it perform better against certain "file systems"? E.g. it S3 not recommended for it? How about EFS?
