questions regarding setup a new barman server

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Hi,
I'm trying to configure a barman server that would manage the backup and restore in the cluster in our company. I'm trying understand a few things and I have many questions. I would be happy to get some anwers : 

1)I decided to use the streaming option for the backups - for wals and for full physical backup with pg_basebackup. However, I was asked (according to documentation) to configure the archive_command. My question is why ? Is there a  reason to use the archive_command and the streaming (pg_recievewal) option ? Now, If I disable the archive_command and use only the streaming option, to automate the process of recieving wals I need to run for each server : barman receive-wal my-pg-server ? Is there a reason to have both archive_command and streaming option ?

2)When I use the command barman receive-wal ptktl-psgsqldb1 I'm getting the next output once a wal is switched : 
ptktl-psgsqldb1: pg_receivewal: starting log streaming at 1F1/F7000000 (timeline 3)
ptktl-psgsqldb1: pg_receivewal: finished segment at 1F1/F8000000 (timeline 3)


However, I dont see those wals in the incoming directory. Why is that ? Is it just an alert for a switch or a message that means that that wal was recieved ?

3)When using the check option I have the next error : 
empty incoming directory: FAILED ('/PostgreSQL/barman//ptktl-psgsqldb1/incoming' must be empty when archiver=off) but I set streaming_archiver to on. Moreover I dont see any errors in the errors directory.

4)When I tried to take a full backup via barman backup ptktl-psgsqldb1 it seems that the backup is stuck : 
Starting backup using postgres method for server ptktl-psgsqldb1 in /PostgreSQL/barman//ptktl-psgsqldb1/base/20180715T114042
Backup start at LSN: 1F1/FB040E28 (00000003000001F1000000FB, 00040E28)
Starting backup copy via pg_basebackup for 20180715T114042

The database is empty ( a new one) but still it doesnt finish...
Any idea why ?

I think that 4 and 2 are connected. Any idea guys ?

Thanks , Mariel.

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