Cyrus backups and deleted (users, mailboxes)

[Deborah Pickett]

Semi-related questions about how Cyrus backup servers deal with deleted 
stuff.

I have the following settings on the main mail server:

deletedprefix: DELETED
delete_mode: delayed
expunge_mode: delayed

My first question is about deleted folders.  Scenario: I delete a folder 
on the server, and it is renamed into the DELETED namespace as 
expected.  I cannot back these folders up to the backup server.  They 
are not enumerated during "XBACKUP * channel", and if I name the DELETED 
namespace explicitly I get the following output:

x xbackup DELETED/* rsync
* NO MAILBOX polyfoam.com.au!DELETED.rawmaterials.Trash.Downer 
EDI.5DAD45A0 (Mailbox is locked)
* NO MAILBOX polyfoam.com.au!DELETED.support.Has Spaces.5DCA22F4 
(Mailbox is locked)
x NO Mailbox is locked

(Which is not nearly the whole list either: it should have listed 
hundreds of deleted folders.)

Is this expected behaviour?  I suppose that my backup has a copy of this 
folder in its original location before it was deleted, so no one will 
miss these folders, (though I can imagine scenarios where a message 
arrives and is quickly put into a folder which is then deleted, and this 
message will never touch the backup server).

My second question is about deleted users.  Scenario: A user "alice" 
departs the company, and I delete their root mailbox on the main 
server.  It is no longer enumerated during "XBACKUP * channel".

What will happen to the backup file a/alice_XXXXXX on the backup 
server?  Will it stay there forever?  Do I need to manually delete it?  
Do I need to manually remove alice from /var/lib/cyrus/backups.db?  I 
suppose I can use "ctl_backups list -t" to detect such files.  Any other 
things I should be aware of?

-- 
*Deborah Pickett*
System Administrator
*Polyfoam Australia Pty Ltd*