24.3. Continuous Archiving and Point-in-Time Recovery (PITR)
24.3.1. Setting Up WAL Archiving
24.3.2. Making a Base Backup
24.3.3. Making a Base Backup Using the Low Level API
24.3.4. Recovering Using a Continuous Archive Backup
24.3.5. Timelines
24.3.6. Tips and Examples
24.3.7. Caveats
"File System Level Backup" should be last, and should link to pg_basebackup as the strongly recommended method.
I'm not too keen on how pg_basebackup is only covered under continuous archiving and PITR, but OTOH that's really how it's mostly used .... and I think most people who're doing physical backups are doing continuous archiving. Or should be.
I'd also be inclined to add a hint in the sql dumps section to the effect that while there's no incremental/differential pg_dump support, you can do incrementals with continuous archiving.
In "Making a base backup" discussion of pg_basebackup should probably mention that 'pg_basebackup -X stream' is required if you want a self-contained base backup.
I think that'd address most of the confusion I've seen on occasion.
I'd love to spend several solid days reorganizing and updating those docs some day, but I think that for now moving some chunks around will still help.