Barman[1] gives you something better than incremental backups actually. It sets up the backup server as a database slave via PG's built-in replication. It gives you point in time recovery with the nicest CLI of any backup tool for any DB I've ever used.
If you think backup tools are a minus for PG, I guess you've never used barman. Easy as pie and has saved my bacon several times when CASCADE DELETE wrecked a few dbs for me due to coworkers futzing around.