By watching which records the WAL changed since last backup, it saves a list of records to back up as incremental. Neat. Now if your db works like append only,

By watching which records the WAL changed since last backup, it saves a list of records to back up as incremental. Neat. Now if your db works like append only, this may need t be as big as a savings as someone who updates the same records a lot (as at incremental backup time it only needs to save the final values of those records). This could be used in replication topographies and scenarios. Maybe PG 18.