Are you just talking about backing up the config files in /etc/postfix?
I would recommend using git for version control; there is nothing special about 
backing up the postfix configs vis a vis any other service on your machine.  It 
also wouldn’t hurt to take periodic snapshots of your VMs

Sent from my iPad

> On Mar 28, 2023, at 22:57, Byung-Hee HWANG via Postfix-users 
> <postfix-users@postfix.org> wrote:
> 
> Hellow,
> 
> I am running two Postfix servers. Both are in Cloud -- Google GCP and
> Rimuhosting-EU VM. Recently i thought that i have to backup servers
> setting values. Because sometimes i meet minor accidents.
> 
> Somebody say Docker is good for backup. Though i would like to hear more
> opinions. Any comments welcome!
> 
> My domain is this [DORAJI.XYZ].
> 
> Sincerely,
> 
> -- 
> ^고맙습니다 _地平天成_ 감사합니다_^))//
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