Doc and samples are missing an example for scenario 1b

[rgarrigue]

Hello

The 2.5 documentation underline doing a streaming + rsync scenario is the most robust method for backup, the scenario 1b. But the way to do so is undocumented, the provided example are rsync only & streaming only. I tried mixing both, I ended up with a streaming-only result, which doesn't backup files outside PGDATA (postgresql.conf, pg_hba.conf, ...).

So please add an explanation & example in the doc. And adding the example in the package samples delivered in /etc/barman.d would be sweet too :-)

While I'm around, I must say, good work on barman, it's a nice piece of software. The doc is a bit confusing at first between old rsync way and new streaming recommended way but after a week on the topic, except for the above configuration example everything is here. Keep up the good work !