Backup mailbox: how to? (do not delete on 2)

[fcorbelli]

I am having trouble figuring out if it is possible to use imapsync as a backup method, and not a synchronization procedure (like here #65)

The goal to be achieved is to copy all e-mail 1 to an account 2
If a message is deleted from 1 it should NOT be deleted from 2
2 will then be, in essence, a historical archive of all messages from 1

But this example does not work.
When a message is Thunderbird-deleted from 1, it will be deleted (after run) from 2, even if --noexpunge2 and --nouidexpunge2

imapsync 
-tls1 
--host1 imap.myemail.com 
--user1 pippo@myemail.com 
--password1 thegoodpassword1 

-tls2 
--host2 192.168.0.2 
--user2 pippo@posta.locale 
--password2 thegoodpassword2 
--nofoldersizesatend  
--noexpunge2 
--nouidexpunge2

Is it possible to avoid this behavior?

Thank you

[gilleslamiral]

Try this, it removes the \DELETED flag, if any:

Windows:   imapsync.exe ... --regexflag "s/\\DELETED//gi" 
Unix:      imapsync ...     --regexflag 's/\\DELETED//gi'