online conversion using replication?

[B. Reino]

On Mon, 3 Sep 2018, Sami Ketola wrote:

>> On 3 Sep 2018, at 4.18, Daniel Miller <dmiller at amfes.com> wrote:
>>
>> That works for a one-time migration, or perhaps via a cron-job, but what I want is basically a constant one-way backup and it seems replication could do it more elegantly & efficiently.
>>
>
> So you want real-time archiving? What we have done with couple of customers is that we just configure MTA to replicate all incoming mails to secondary site.

Would you mind showing how you're doing it?
(hopefully with postfix, otherwise it may not be so interesting to me..)

Thanks.