Two questions

[mailing at scastagnoli.info]

Hello everyone!
I have two problems, maybe very simple but I cannot find out a solution.
1)
How can I backup and recover Cyrus mailboxes? I've found something like
this to backup:
su - cyrus -c "ctl_mboxlist -d" > /var/lib/imap/mboxlist.txt

but how can I recover my mailboxes from mboxlist.txt?

2)
How can I delete messages inside my IMAP mailboxes from Evolution?
I try to cancel them but I cannot completely remove from IMAP mailbox.

Thanks a lot for attention and any help you could give me!

Stefano C.