Doveadm Backup (other) issues

[Gingko]

Hello,

I also have issues using Dovecot Backup.

I am trying to Backup (or possibly Sync - one way) a single user IMAP 
account from a remote server, unknown type, to my own server.

For that purpose, I defined the following parameters :

imapc_host = <host name>
imapc_user = <user name>
imapc_password = <password>
imapc_features = rfc822.size

(<user name> has format: name at example.com, and <host name> is the name 
of the imap remote server that I use for getting mails)

… and then  I issued the following command:

doveadm backup -R -u <user name, format name at example.com> imapc:

... but doing this, I get the following answer:

dsync(<user name>): Info: imapc(<host name>:143): Connected to <host IP 
address>:143 (local 192.168.1.2:52940)
dsync(<user name>): Error: Failed to initialize user: namespace 
configuration error: Namespace mail/ can't have alias_for= to a 
different storage (different root dirs)

How can I solve this?

If there is something not matching between servers, I may eventually 
change configuration on my side, but I think I would first have to know 
which feature(s) I have to know from the remote server in order to 
create the matching one on my server.

Is there a way to list all relevant data coming from the remote server?

Also:

Doing this, is it necessary that the source user name be the same as the 
destination user name? Is it possible to backup an IMAP account to a 
user account having a completely different name?

Regards,

Gingko

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