Re: [Dovecot] Any suggestions for backing up an imap server and whould maildir or dbox be better than mbox?

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BTW: Dose changing the mailbox format from mbox to Maildir or dbox dose have any advantages?

I don't think it makes any difference in this case.

It would make a difference if you were to Rsync. Since Rsync is done on a file level; with mbox every new message means that the entire mbox file will need to be copied out. If you are using Maildir or dbox when you run an rsync it will only copy over the new messages since last Rsync run, being that it's a single new file per message.

Of course this holds true with any incremental type backups.